# Paleobiota of the Green River Formation

The Green River Formation is a geological formation located in the Intermountain West of the United States, in the states of Colorado, Utah, and Wyoming. It comprises sediments deposited during the Early Eocene in a series of large freshwater lakes: Lake Gosiute, Lake Uinta, and Fossil Lake (the last containing Fossil Butte National Monument). It preserves a high diversity of freshwater fish, birds, reptiles, and mammals, with some sections of the formation (including Fossil Lake and the Parachute Creek member of Lake Uinta) qualifying as Konservat-Lagerstätten due to their extremely well-preserved fossils.

## Cartilaginous fish

| Family | Genus | Species | Member | Abundance | Notes | Image |
| †Asterotrygonidae | †Asterotrygon | †A. maloneyi Carvalho, Maisey & Grande, 2004 | Fossil Lake | | An Asterotrygonidae stingray of uncertain higher affinities. | |
| †Heliobatidae | †Heliobatis | †H. radians Marsh, 1877 | Fossil Lake | | A Heliobatid stingray of uncertain higher affinities. H. radians synonymy Dasyatis species Haseman, 1912 Palaeodasybatis discus Fowler, 1947 Xiphotrygon acutidens Cope, 1879 Xyphotrygus species Romer, 1971 | |

## Bony fish

Primarily based on Grande (2001), with changes where necessary:

### Acipenseriformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Polyodontidae | †Crossopholis | †C. magnicaudatus Cope, 1883 | Fossil Lake | | A paddlefish. | |

### Lepisosteiformes

| Family | Genus | Species | Member | Notes |
| Lepisosteidae | Atractosteus | †A. atrox (Leidy, 1873) | Fossil Lake | An alligator gar relative. A. atrox is the largest Green River gar. |
| Lepisosteidae | Atractosteus | †A. simplex (Leidy 1873) | Fossil Lake Lake Gosiute? | An alligator gar relative. |
| Lepisosteidae | †Cuneatus | †C. cuneatus (Cope, 1884) | Fossil Lake? Lake Gosiute Lake Uinta | A Cuneatini tribe gar. |
| Lepisosteidae | †Cuneatus | †C. wileyi Grande, 2010 | Lake Uinta | A Cuneatini tribe gar. |
| Lepisosteidae | Lepisosteus | †L. bemisi Grande, 2010 | Fossil Lake | A Lepisosteini tribe gar. |
| Lepisosteidae | †Masillosteus | †M. janeae Grande, 2010 | Fossil Lake | A Cuneatini tribe gar. |

### Amiiformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Amiidae | Amia | †A. pattersoni Grande & Bemis, 1998 | Fossil Lake Lake Gosiute | | An amiid bowfin. | |
| Amiidae | †Cyclurus | †C. gurleyi (Romer & Fryxell, 1928) | Fossil Lake | Only 8 specimens known | An amiid related to modern bowfins. | |

### Hiodontiformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Hiodontidae | Hiodon | †H. falcatus (Grande, 1979) | Fossil Lake | | A hiodontid. First described as Eohiodon falcatus (1979). | |

### Osteoglossiformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Osteoglossidae | †Phareodus | †P. encaustus (Cope, 1871) | Fossil Lake Lake Gosiute | | A phareodontine bonytongue. | |
| Osteoglossidae | †Phareodus | †P. testis (Leidy, 1873) | Fossil Lake | | A phareodontine bonytongue. | |

### Ellimmichthyiformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| †Armigatidae | †Diplomystus | †D. dentatus Cope, 1877 | Fossil Lake Lake Gosiute Lake Uinta | | An armigatid ellimmichthyiform. | |

### Clupeiformes

| Family | Genus | Species | Member | Abundance | Notes |
| Clupeidae | †Gosiutichthys | †G. parvus Grande, 1982 | Lake Gosiute | | A clupeine clupeid herring relative. |
| Clupeidae | †Knightia | †K. alta (Leidy, 1873) | Fossil Lake Lake Gosiute Lake Uinta | | A pellonuline clupeid herring relative. |
| Clupeidae | †Knightia | †K. eocaena Jordan, 1907 | Fossil Lake Lake Gosiute Lake Uinta | The most common articulated vertebrate fossil worldwide. | A pellonuline clupeid herring relative. |

### Gonorynchiformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Gonorynchidae | †Notogoneus | †N. osculus Cope, 1885 | Fossil Lake | | A beaked sandfish. Last gonorynchid known from North America. Bottom feeding trace fossils are attributed to N. osculus. | |

### Cypriniformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Catostomidae | †Amyzon | †A. gosiutensis Grande, Eastman, & Cavender, 1982 | Lake Gosiute | | An ictiobine sucker. | |

### Siluriformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| †Hypsidoridae | †Hypsidoris | †H. farsonensis Lundberg & Case, 1970 | Lake Gosiute | | A hypsidorid catfish. | |
| Ictaluridae | †Astephus | †A. antiquus (Leidy, 1873) | Fossil Lake Lake Gosiute Lake Uinta | | An ictalurid catfish. | |

### Salmoniformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Esocidae | Esox | †E. kronneri Grande, 1999 | Fossil Lake | 1 specimen | A pike or muskellunge species. Likely native to surrounding streams or rivers and not the lakes. | |

### Percopsiformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Percopsidae | †Amphiplaga | †A. brachyptera Cope, 1877 | Fossil Lake | | A trout-perch relative. Includes the jr synonym Erismatopterus endlichi (1877) | |
| Percopsidae | †Erismatopterus | †E. levatus (Cope, 1870) | Lake Gosiute Lake Uinta | | A trout-perch relative. First described as Cyprinodon levatus (1870) includes the jr synonym Erismatopterus rickseckeri (1871) | |

### Carangiformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Latidae | †Mioplosus | †M. labracoides Cope, 1877 | Fossil Lake Lake Gosiute Lake Uinta | | A lates perches relative. | |

### Acanthuriformes

| Family | Genus | Species | Member | Abundance | Notes |
| Moronidae | †Cockerellites | †C. liops (Cope, 1877) | Fossil Lake | common | A planktivorous/insectivorous temperate bass. First described as Priscacara liops (1877) First moved to Cockerellites liops in 1923. |
| Moronidae | †Hypsiprisca | †H. hypsacantha (Cope, 1886) | Fossil Lake | rare | A temperate bass. First named Priscacara hypsacantha 1886) |
| Moronidae | †Hypsiprisca | †H. sp. | Fossil Lake | rare | An undescribed species of Hypsiprisca. A slenderer species with a more rounded tail fin outline. |
| Moronidae | †Priscacara | †P. serrata Cope, 1877 | Fossil Lake Lake Uinta | | A temperate bass. |
| Moronidae | †Priscacara | †P. sp. a | Fossil Lake | 1 specimen | An undescribed Priscacara Specimens have a rounder body and weak dorsal spines. |
| Moronidae | †Priscacara | †P. sp. b. | Fossil Lake | 1 specimen | An undescribed Priscacara Possibly a new species or a variant specimen with 4 anal spines. |

### Incertae sedis

| Family | Genus | Species | Member | Abundance | Notes | Image |
| †Asineopidae | †Asineops | †A. squamifrons Cope, 1870 | Fossil Lake Lake Gosiute Lake Uinta | | An acanthomorph of uncertain affinities Possibly a percopsiform, polymixiiform, or perciform. | |
| †Asineopidae | †Asineops | A. sp. | Fossil Lake | | An undescribed Asineops species Restricted to Fossil Lake. | |

## Amphibians
### Frogs

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Pelodytidae | †Aerugoamnis | †A. paulus Henrici et al., 2013 | Fossil Lake | 2 specimens | A stem-relative of parsley frogs. | |

### Salamanders

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Amphiumidae | †Paleoamphiuma | †P. tetradactylum Rieppel & Grande, 1998 | Fossil Lake | | A sirenid salamander. | |

## Reptiles
### Squamates

| Family | Genus | Species | Member | Abundance | Notes |
| Boidae | †Boavus | †B. idelmani Gilmore, 1938 | Fossil Lake | | A boa. |
| Dactyloidae | †Afairiguana | †A. avius Conrad et al., 2007 | Fossil Lake | | A stem-anole. |
| Shinisauridae | †Bahndwivici | †B. ammoskius Conrad, 2006 | Fossil Lake | | A relative of the Chinese crocodile lizard. |
| Tropidophiidae? | †Dunnophis | D. sp. | Fossil Lake | | An undescribed possible dwarf boa. |
| Varanidae | †Saniwa | †S. ensidens Leidy, 1870 | Fossil Lake | | A stem-monitor lizard. |
| Incertae sedis | Indeterminate | Indeterminate | Lake Uinta (Parachute Creek) | 1 specimen | A possible gecko or iguanid Preserved with soft tissue and skin, but bones dissolved. |
| Incertae sedis | Indeterminate | Indeterminate | Lake Uinta (Parachute Creek) | 1 specimen | A relative of Shinisaurids Preserved with soft tissue and skin, but bones dissolved. |

### Crocodilians

| Family | Genus | Species | Member | Abundance | Notes |
| Alligatoridae | †Tsoabichi | †T. greenriverensis Brochu, 2010 | Fossil Lake | | A caiman. |
| Incertae sedis | †Borealosuchus | †B. wilsoni (Mook, 1959) | Fossil Lake | | A eusuchian crocodyliform of uncertain affinities. Moved from Leidyosuchus wilsoni (1959) |
| Incertae sedis | †Borealosuchus | Cf. †B. sp. | Fossil Lake | | Indeterminate eusuchian bones close to Borealosuchus. |
| Incertae sedis | "Crocodylus" | †"Crocodylus" acer Cope, 1882 | Lake Uinta (Manti beds) | 1 specimen | A Crocodyloidea of unplaced affinity. Not a Crocodylus species, but not given a new genus as of 2024. |
| Incertae sedis | "Crocodylus" | Cf. †"Crocodylus" affinis Cope, 1871 | Lake Gosiute | | Bones close in morphology to †"Crocodylus" affinis A Crocodyloidea of unplaced affinity. Not a Crocodylus species, but not given a new genus as of 2024. |

### Turtles

| Family | Genus | Species | Member | Abundance | Notes |
| Baenidae | †Chisternon | †C. undatum (Leidy, 1871) | Fossil Lake | | A baenid. |
| Dermatemydidae | †Baptemys | †B. wyomingensis Leidy, 1873 | Fossil Lake | | A dermatemydid. |
| Dermatemydidae | †Baptemys | †B. Cf. wyomingensis Leidy, 1873 | Lake Unita | | A dermatemydid. |
| Geoemydidae | †Echmatemys | †E. haydeni (Cope, 1873) | | 1 specimen | A geoemydid tortoise. |
| Geoemydidae | †Echmatemys | †E. naomi (Leidy, 1871) | Fossil Lake | 1 specimen | A geoemydid tortoise. |
| Geoemydidae | †Echmatemys | †E. wyomingensis Leidy, 1872 | Fossil Lake | | A geoemydid tortoise. |
| Testudinidae | †Hadrianus | †Cf. †H. corsoni (Leidy, 1871) | Fossil Lake | | A tortoise species. A single complete hatchling |
| Trionychidae | †Axestemys | A. sp. | Fossil Lake | | A softshell turtle. |
| Trionychidae | †Oliveremys | †O. uintaensis Cope, 1873 | Fossil Lake | | A softshell turtle. |
| Trionychidae | †Plastomenus | †P. thomasii (Cope, 1872 | Fossil Lake | | A softshell turtle. |

## Birds
### Lithornithiformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| †Lithornithidae | †Lithornis | †L. grandei | Fossil Lake | | A lithornithid. First described as Calciavis grandei. | |
| †Lithornithidae | †Pseudocrypturus | †P. cercanaxius | Fossil Lake | | A lithornithid. | |

### Anseriformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| †Presbyornithidae | †Presbyornis | †P. pervetus | Fossil Lake | | A presbyornithid anseriform. | |
| Incertae sedis | †Paakniwatavis | †P. grandei | Fossil Lake | | An anseriform of uncertain affinities. | |

### Galliformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| †Gallinuloididae | †Gallinuloides | †G. wyomingensis | Fossil Lake | | A gallinuloid galliform. | |

### Coliiformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| †Sandcoleidae | †Anneavis | †A. annae | Fossil Lake | | A sandcoleid mousebird. | |
| Incertae sedis | †Celericolius | †C. acriala | Fossil Lake | | A stem-mousebird. | |

### Leptosomiformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| incertae sedis | †Plesiocathartes | †P. major Weidig, 2006 | Fossil Lake | | A stem-cuckoo roller. | |
| incertae sedis | †Plesiocathartes | †P. wyomingensis Weidig, 2006 | Fossil Lake | | A stem-cuckoo roller | |

### Coraciiformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Primobucconidae | †Primobucco | †P. mcgrewi | Fossil Lake | | A primobucconid coraciiform. | |
| Incertae sedis | †Paracoracias | †P. occidentalis | | | A coraciiform. | |

### Piciformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Incertae sedis | †Neanis | †N. schucherti | Fossil Lake | | A possible piciform of uncertain affinities. | |
| Incertae sedis | †Pristineanis | †P. kistneri | Fossil Lake (Fossil Butte Member) Lake Gosiute (Tipton tongue Member) | 2 specimens | A possible piciform of uncertain affinities. First described as Primobucco kistneri (1973) Moved from Neanis kistneri 1976) | |

### Strisores

| Family | Genus | Species | Member | Abundance | Notes |
| Eocypselidae | †Eocypselus | †E. rowei | Fossil Lake | | A eocypselid apodiform. |
| Fluvioviridavidae | †Fluvioviridavis | †F. platyrhamphus Mayr & Daniels, 2001 | Fossil Lake | 2 specimens | A basal strisore, possibly a stem-frogmouth. |
| Incertae sedis | †Prefica | †P. nivea | Fossil Lake | | A stem-oilbird. |

### Musophagiformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Musophagidae? | †Foro | †F. panarium | Fossil Lake | 1 specimen | A possible stem-turaco. | |

### Mirandornithes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Incertae sedis | †Juncitarsus | †J. merkeli | Fossil Lake | | A stem-mirandornithine. | |

### Suliformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Fregatidae | †Limnofregata | L. azygosternon | Fossil Lake | | An early frigatebird. | |
| Fregatidae | †Limnofregata | L. hasegawai | Fossil Lake | | An early frigatebird | |

### Pelecaniformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Threskiornithidae | †Rhynchaeites | †R. sp. | | 1 specimen | An undescribed ibis, known from a largely complete specimen. | R. messelensis, a related species |
| Threskiornithidae | †Vadaravis | †V. brownae | Fossil Lake | | Potentially a stem-ibis, but may be an indeterminate aequornithine. | |

### Charadriiformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Indeterminate | Indeterminate | Indeterminate | Lake Uinta | 1 trace specimen | A shorebird Potentially the earliest record of recurvirostrids Known from a 3 footprint trackway. | |

### Gruiformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| †Messelornithidae | †Messelornis | †M. nearctica | Fossil Lake | | A messelornithid. | Specimen of a related species |

### Eufalconimorphae

| Family | Genus | Species | Member | Notes |
| †Halcyornithidae | †Cyrilavis | †C. colburnorum | Fossil Lake | A halcyornithid. |
| †Halcyornithidae | †Cyrilavis | †C. olsoni | Fossil Lake | A halcyornithid. |
| †Messelasturidae | †Tynskya | †T. eocaena | Fossil Lake | A messelasturid. |
| †Psittacopedidae | †Eofringillirostrum | †E. boudreauxi | Fossil Lake | A psittacopedid. |
| †Vastanavidae | †Avolatavis | †A. tenens | Fossil Lake | A vastanavid. |
| †Zygodactylidae | †Eozygodactylus | †E. americanus | Fossil Lake | A zygodactylid. |
| †Zygodactylidae | †Zygodactylus | †Z. grandei | Fossil Lake | A zygodactylid. |

### Neoaves incertae sedis

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Incertae sedis | †Nahmavis | †N. grandei | Fossil Lake | 1 specimen | Either a stem-gruiform or a stem-charadriiform. | |
Two other genera, "Eoeurypyga" (a stem-sunbittern) and "Wyomingcypselus" (an early apodiform) are mentioned only in a 2002 dissertation, and are presently nomina nuda.

### Avian ichnofossils

| Family | Genus | Species | Member | Notes |
| †Avipedidae | †Avipeda | Cf. †A. phoenix Vyalov, 1960 | Lake Unita | Avian trackways with three forward facing toes without inter-digit webbing. |
| †Ignotornidae | †Quadridigitus | †Q. semimembranus Lockley et al., 2021 | Lake Unita | Avian trackways with three forward facing toes, a hallux, and inter-digit webbing. |
| †Jindongornipodidae | †Jindongornipes | †J. falkbuckleyi Lockley et al., 2021 | Lake Unita | Large avian trackways with four toes, and wide spread between digits II and IV. |
| Incertae sedis | †Presbyornithiformipes | †P. feduccii Yang et al., 1995 | Lake Uinta | Duck-like trackways with dabble marks attributed to Presbyornis. |

## Mammals

Partially based on Grande (1984). Aside from the few well-preserved mammals found in Fossil Lake, a majority of Green River mammals are based on isolated bones and teeth:

### Metatheria

| Family | Genus | Species | Member | Abundance | Notes | Image |
| †Herpetotheriidae | †Herpetotherium | †H. innominatum | Lake Gosiute Lake Uinta | | An opossum-like basal metatherian Originally described as Peratherium innominatum. | H. huntii, a related species |
| †Herpetotheriidae | †Herpetotherium | †H. knighti | Lake Gosiute | | An opossum-like basal metatherian. | H. huntii, a related species |

### Cimolesta

| Family | Genus | Species | Member | Abundance | Notes | Image |
| †Pantolestidae | †Palaeosinopa | †P. didelphoides | Fossil Lake | | A semi-aquatic pantolestid. | |

### Chiroptera

| Family | Genus | Species | Member | Abundance | Notes |
| †Icaronycteridae | †Icaronycteris | †I. gunnelli | Fossil Lake | 2 specimens | An icaronycterid bat. |
| †Icaronycteridae | †Icaronycteris | †I. index | Fossil Lake | 2 specimens | An icaronycterid bat. |
| †Onychonycteridae | †Onychonycteris | †O. finneyi | Fossil Lake | 2 specimens | An onychonycterid bat. |

### Eulipotyphla

| family | Genus | Species | Member | Abundance | Notes | Image |
| Nyctitheriidae | Nyctitherium | N. nitidum | Lake Gosiute | | A nyctitheriid. Originally described as Talpavus nitidus. | |
| Nyctitheriidae | Nyctitherium | N. sp. | Lake Uinta | | A nyctitheriid. Originally described as Talpavus nitidus. |

### Pan-Carnivora

| Family | Genus | Species | Member | Notes | Image |
| Miacidae | Vulpavus | V. profectus | Lake Gosiute | A miacid. | |
| Miacidae | Indeterminate | indeterminate | Lake Gosiute Lake Uinta | Indeterminate miacid bones. | |
| Sinopidae | Sinopa | S. minor | Lake Uinta | A sinopid hyaenodont. | S. rapax, a related species |
| Viverravidae | Viverravus | V. minutus | Lake Uinta | A viverravid. | |
| Incertae sedis | "Miacis" | "M." gracilis | Lake Uinta | A carnivoraform of uncertain affinities. | |

### Paraxonia

| family | Genus | Species | Member | Abundance | Notes | Image |
| Mesonychidae | †Mesonyx? | Indeterminate | Lake Gosiute | | Indeterminate mesonychid bones. First described as Mesonyx obtusidens Cope, 1872 | |

### Pan-Perissodactyla

| family | Genus | Species | Member | Abundance | Notes |
| †Brontotheriidae | †Lambdotherium | †L. popoagicum | Fossil Lake | | A small-sized basal brontothere. |
| †Brontotheriidae | †L. sp. | Lake Unita | | A small-sized basal brontothere. Reported from Powder Wash, Utah by Cope (1880) | |
| Equidae | †Protorohippus | †Aff. P. venticolus | Fossil Lake | 2 specimens | An equid closely affiliated with P. venticolus. |
| Equidae | Indeterminate | Indeterminate | Lake Gosiute Lake Unita< | Indeterminate equiid bones. First identified as Hyracotherium sp. | |
| †Hyopsodontidae | †Hyopsodus | †H. minusculus | Lake Gosiute Lake Uinta | | A hyopsodontid. |
| †Hyopsodontidae | †Hyopsodus | †H. paulus (=H. vicarius) | Lake Uinta | | A hyopsodontid. includes H. vicarius specimens. |
| †Hyopsodontidae | †Hyopsodus | †H. wortmani | Fossil Lake | | A hyopsodontid. |
| ↑Hyrachyidae | ↑Hyrachyus | Indeterminate | Lake Unita | | Undeterminate Hyrachyus bones. |
| Indeterminate | Indeterminate | Indeterminate | Fossil Lake | 1 specimen | A juvenile tapiromorph, the largest mammal known from the formation. Initially described as Heptodon calciculus. |

### Apatotheria

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Apatemyidae | Apatemys | A. chardini Jepsen, 1930 | Fossil Lake | 1 specimen | An apatemyid. | |

### Rodentia

| Family | Genus | Species | Member | Notes | Image |
| Ischyromyidae | Paramys | P. sp. | Lake Uinta | A ischyromyid rodent. | P. delicatus |
| Ischyromyidae | Thisbemys | T. sp. | Lake Gosiute | An undescribed ischyromyid rodent. | T. plicatus |
| Sciuravidae | Sciuravus | S. eucristadens (Burke, 1937) | Lake Uinta (Douglas Creek Member) | A sciuravid rodent. Originally described as Viverravus eucristadens (1937). | |
| Sciuravidae | Sciuravus | S. sp. | Lake Uinta | An undescribed sciuravid. | |

### Primatomorpha

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Microsyopidae | Microsyops | M. elegans | Lake Gosiute | | A microsyopid stem-primate. | M. cardiorestes, a related species |
| Microsyopidae | Uintasorex | U. parvulus | Lake Gosiute | | A microsyopid stem-primate. | |
| Notharctidae | Notharctus | N. sp. | Lake Gosiute | | A notharctid adapiform. | N. tenebrosus |
| Notharctidae | Smilodectes | S. gracilis | Lake Uinta | | A notharctid adapiform. Formerly included in Notharctus matthewi. | |
| Omomyidae | Anemorhysis | A. sp. | Lake Unita | 1 specimen (lost?) | An omomyid primate. First named as Uintalacus nettingi (1958) Deemed Anemorhysis sp indeterminate (1976) | |
| Omomyidae | Omomys | O. carteri | Lake Uinta | | An omomyid primate. Includes O. pucillus | |
| Omomyidae | Tetonius | T. sp. | Lake Uinta | | An omomyid primate. | T. homunculus |
| Omomyidae | Washakius | W. insignis | Lake Gosiute | | An omomyid primate. | |

## Arthropoda
### Arachnida
#### Acariformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Cheyletidae | Indeterminate | Indeterminate | Lake Unita | 1 specimen | A Chelytidae mite. Found in thin sectioning of rock samples. | |

#### Araneae

| Family | Genus | Species | Member | Abundance | Notes |
| Araneidae | Araneus | A. sp | Lake Gosiute | 6 specimens | Possible orbweb-spiders, known from partial fossils First placed as Epeira sp. |
| Hersiliidae | Hersiliola (sensu lato) | H. sp. | Lake Uinta (Parachute Creek Member) | 1 male | A tree trunk spider. |
| Selenopidae | Indeterminate | Indeterminate | Lake Uinta (Parachute Creek Member) | 1 specimen | A female or juvenile selenopid spider. |
| Thomisidae | Indeterminate | Indeterminate | Lake Uinta (Parachute Creek Member) | 2 males, 1 juv female | Crab spiders. |
| Uloboridae | Miagrammopes | M. sp. | Lake Uinta (Parachute Creek Member) | 1 female, 2 males | A uloborid spider. |
| Uloboridae | Indeterminate | Indeterminate | Lake Uinta (Parachute Creek Member) | | A uloborid spider. |
| Unidentified | †Araneaovoius (Scudder, 1878) | †A. columbiae | | 1 specimen | An orb-web spider egg sack. First described as "Aranea" columbiae (1878) |

#### Parasitiformes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Ixodidae | Ixodes | †"I." tertiarius Scudder, 1885 | Lake Uinta (Laney Member) | 1 specimen | A punitive ixodid hard tick. Type specimen declared lost species considered nomen dubium by Dunlop (2011) | |

#### Scorpiones

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Buthidae | †Uintascorpio | †U. halandrasi Perry, 1995 | Lake Uinta (Parachute Creek Member) | 1 specimen | A buthid scorpion. | |

### Crustacea
#### Branchiopoda

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Cyclestheriidae | †Cyclestherioides | †C. wyomingensis | Lake Gosiute (Laney) | | A cyclestheriid clam shrimp. | |
| Lynceidae | †Prolynceus | †P. laneyensis | Lake Gosiute (Laney) | | A clam shrimp. | |

#### Decapods

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Palaemonidae | †Bechleja | †B. rostrata | Fossil Lake | | A palaemonid shrimp. | |
| Cambaridae | Procambarus | †P. primaevus | Fossil Lake | | A cambarid crayfish. | |

#### Ostracoda

| Family | Genus | Species | Member | Notes |
| Candonidae | Candona | C. artesensis Swain, 1964 | Fossil Lake Lake Unita | A candonid ostracod. |
| Candonidae | Candona | C. rangliensis Swain, 1964 | Fossil Lake Lake Unita | A candonid ostracod. |
| Candonidae | Candona | C. whitei Scott & Smith, 1951 | Fossil Lake Lake Gosiute Lake Unita | A candonid ostracod. |
| Candonidae | Tuberocypris | T. centronotus Swain, 1964 | Lake Unita | A candonid ostracod. |
| †Cyprideidae | †Cypridea | †C. bisulcata Swain, 1949 | Lake Unita | A cyprideid ostracod. |
| Cyprididae | †Advenocypris | †A. umbonata Swain, 1964 | Lake unita | A cypridid ostracod. |
| Cyprididae | Hemicyprinotus | †H. watsonensis Swain, 1964 | Lake unita | A cypridid ostracod. One described subspecies H. watsonensis emaciata |
| Cyprididae | Heterocypris | †H. riflensis Swain, 1964 | Lake unita | A cypridid ostracod. |
| Cyprididae | Heterocypris | †H. whiteriverensis Swain, 1964 | Lake unita | A cypridid ostracod. |
| Cyprididae | Potamocypris | †P. williamsi Swain, 1964 | Fossil Lake Lake Unita | A cypridid ostracod. |
| Cyprididae | †Procyprois | †P. ravenridgensis Swain, 1964 | Lake Unita | A cypridid ostracod. Male and female specimens show shell sexual dimorphism |
| Cyprididae | Pseudoeucypris | †P. pagei (Swain) Swain, 1956 | Lake Unita | A cypridid ostracod. First described as Candona pagei (1949) Moved from Cypris pagei (1956) |
| Cyprididae | Scottia | †S. subquadrata Swain, 1964 | Lake Unita | A cypridid ostracod. |
| Cyprididae | Stenocypris | Cf. S. sinuata G.W. Müller, 1898 | Lake Unita | A cypridid ostracod. |
| Limnocytheridae | Limnocythere | L. sp. | Lake Unita | Indistinct limnocytherid fossils. |
| Limnocytheridae | Metacypris | †M. paracordata Swain, 1964 | Lake Unita | A limnocytherid ostracod. |
| Notodromadidae | Cyprois | †C. ephraimensis Swain, 1964 | Fossil Lake Lake Gosiute Lake Unita | A notodromadid ostracod. |

### Myriapoda

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Parajulidae | "Julus" | "J." telluster Scudder, 1878 | Lake Gosiue | 1 specimen | A parajulidae millipede in need of redescription. First described as Iulus telluster (1878). | |

### Insecta
#### Coleoptera
##### Adephaga

| Family | Genus | Species | Member | Abundance | Notes |
| Carabidae | Bembidion | †B. exoletum Scudder, 1876 | Lake Unita | 1 specimen | A Bembidiini tribe trechine ground beetle. |
| Carabidae | †Carabites | †C. eocenicus Cockerell, 1921 | Lake Unita | | A ground beetle of uncertain subfamily affiliation. |
| Carabidae | †Carabites | †C. exanimus Scudder, 1892 | Lake Uinta | 1 specimen | A ground beetle of uncertain subfamily affiliation. |
| Carabidae | Harpalus | †H. veterum Cockerell, 1921 | Lake Uinta | | A Harpalini tribe harpaline ground beetle. |
| Carabidae | Lebia | †L. protospiloptera Cockerell, 1921 | Lake Unita | | A Lebiini tribe harpaline ground beetle. |
| Carabidae | †Neothanes | †N. testeus (Scudder, 1878) | Lake Gosiute | 2 specimens | A ground beetle of uncertain subfamily affiliation. First named as Cychrus testeus (1878) |
| Carabidae | Platynus | †P. caesus Scudder, 1890 | Lake Gosiute | 2 specimens | A Platynini tribe platynine ground beetle. |
| Carabidae | Platynus | †P. senex Scudder, 1878 | Lake Gosiute | 1 specimen | A Platynini tribe platynine ground beetle. |
| Dytiscidae | Laccophilus | Indeterminate | Lake Uinta | 1 fragment | An indeterminate Laccophilini tribe predaceous diving beetle. |

##### Elateriformia

| Family | Genus | Species | Member | Abundance | Notes |
| Byrrhidae | "Nosodendron" | †"N." tritavum Scudder, 1890 | Lake Gosiute | 1 specimen | A pill beetle in need of redescription. First named as a Nosodendrid beetle. |
| Elateridae | Cardiophorus | †C. exhumatus Cockerell, 1925 | Lake Unita | 1 specimen | A cardiophorine click beetle. |
| Elateridae | Ctenicera | †C. velata (Scudder, 1876) | Lake Gosiute | 1 specimen | A Prosternini tribe dendrometrine click beetle. First named as Corymbites velatus (1876). |
| Elateridae | Oxygonus | †O. mortuus Scudder, 1876 | Lake Uinta | 1 specimen | A Prosternini tribe dendrometrine click beetle. |
| Eucnemidae | Epiphanis | †E. deletus Scudder, 1876 | Lake Unita | 1 specimen | An Epiphanini tribe melasine false click beetle. |

##### Polyphaga - Bostrichiformia

| Family | Genus | Species | Member | Abundance | Notes |
| Ptinidae | Anobium | †A. deceptum Scudder, 1878 | Lake Gosiute | 1 specimen | An Anobiini tribe anobiine death-watch beetle. |
| Ptinidae | Anobium | †A. lignitum Scudder, 1878 | Lake Gosiute | 1 specimen | An Anobiini tribe anobiine death-watch beetle. |
| Ptinidae | Anobium | †A. ovale Scudder, 1878 | Lake Gosiute | 2 specimens | An Anobiini tribe anobiine death-watch beetle. |
| Ptinidae | Stegobium | †S. defunctus (Scudder, 1876) | Lake Gosiute | 1 specimen | A Stegobiini tribe anobiine death-watch beetle. First described as Sitodrepa defuncta (1876). |

##### Polyphaga - Cucujiformia

| Family | Genus | Species | Member | Abundance | Notes |
| Anthribidae | Choragus | †C. fictilis Scudder, 1890 | Lake Gosiute | 1 specimen | A Choragini tribe choragine fungus weevil. |
| Anthribidae | Euparius | †E. elusus (Scudder, 1878) | Lake Gosiute | 2 specimens | A Cratoparini tribe anthribine fungus weevil. First named as Cratoparis? elusus (1878) |
| Anthribidae | Euparius | †E. repertus (Scudder, 1878) | Lake Gosiute | 1 specimen | A Cratoparini tribe anthribine fungus weevil. First named as Cratoparis repertus (1878) |
| Anthribidae | Ormiscus | †O. partitus (Scudder, 1890) | Lake Gosiute | 1 specimen | A Zygaenodini tribe anthribine fungus weevil. First named as Hormiscus partitus (1890) |
| Anthribidae | †Pseudochirotenon | †P. eocaenicus Legalov, 2018 | Lake Unita | 1 specimen | An Ecelonerini tribe anthribine fungus weevil. |
| Anthribidae | Trigonorhinus | †T. pristinus (Scuddr, 1876) | Lake Gosiute | 1 specimen | A Trigonorhinini tribe anthribine fungus weevil. First named as Brachytarsus pristinus (1876) |
| Anthribidae | Tropideres | †T. remotus Scudder, 1893 | Lake Gosiute | 1 specimen | A Tropiderini tribe anthribine fungus weevil. |
| Attelabidae | †Teretrum | †T. quiescitum Scudder, 1893 | Lake Unita | 1 specimen | An Auletini tribe rhynchitine leaf-rolling weevil. |
| Belidae | †Paltorhynchus | †P. bisulcatus Scudder, 1893 | Lake Unita | 2 specimens | A Metrioxenini tribe oxycorynite belid weevil. |
| Brentidae | Apionion | †A. evestigatum (Scudder, 1893) | Lake Unita | 1 specimen | An Apionini tribe apionine primitive weevil. |
| Brentidae | †Palaeonanophyes | †P. zherikhini Legalov, 2015 | Lake Unita | | A Nanophyini tribe nanophyine primitive weevil. |
| Brentidae | Perapion | †P. rasnitsyni Legalov, 2018 | Lake Uinta | 1 specimen | An Aplemonini tribe apionine primitive weevil. |
| Cerambycidae | Clytus | †C. pervetustus (Cockerell, 1921) | Lake Uinta | | A Clytini tribe cerambycine long-horn beetle. First named as Lema pervetusta (1921) |
| Cerambycidae | Saperda | †S. caroli Vitali, 2015 | Lake Unita | | A Saperdini tribe lamiine long-horn beetle. |
| Chrysomelidae | Bruchus | †B. anilis Scudder, 1876 | Lake Unita | 1 specimen | A Bruchini tribe bruchine leaf beetle. |
| Chrysomelidae | Cryptocephalus | †C. vetustus Scudder, 1878 | Lake Gosiute | 2 specimens | A Cryptocephalini tribe cryptocephaline leaf beetle. |
| Chrysomelidae | †Denaeaspis | †D. chelonopsis Chaboo & Engel, 2009 | Lake Unita | 1 specimen | An Imatidiini tribe Cassidine tortoise beetle. |
| Chrysomelidae | †Eosacantha | †E. delocranioides Chaboo & Engel, 2009 | Lake Unita | 1 specimen | A Notosacanthini tribe Cassidine tortoise beetle. |
| Chrysomelidae | †Palaeatalasis | †P. monrosi Legalov, 2021 | Lake Unita | 1 specimen | A Megamerini tribe sagrine leaf beetle. |
| Chrysomelidae | †Pulchritudo | †P. attenboroughi Krell & Vitali, 2021 | Lake Uinta | 1 specimen | A sagrine leaf beetle |
| Cryptophagidae | Antherophagus | †A. priscus Scudder, 1876 | Lake Gosiute | 4 specimens | A Cryptophagini tribe cryptophagine silken fungus beetle. |
| Curculionidae | Anthonomus | †A. revictus Scudder, 1890 | Lake Gosiute | 2 specimens | An Anthonomini tribe curculionine weevil. |
| Curculionidae | Anthonomus | †A. soporus Scudder, 1890 | Lake Gosiute Lake Unita | 7 specimens | An Anthonomini tribe curculionine weevil. |
| Curculionidae | †Archaeoheilus | †A. deleticius (Scudder, 1893) | Lake Uinta | 1 specimen | A Molytini tribe molytine weevil. First named as Pachylobius deleticius (1893) Moved from Hylobius deleticius (2015) |
| Curculionidae | †Archaeoheilus | †A. ovalis Legalov, 2018 | Lake Uinta | 1 specimen | A Molytini tribe molytine weevil. |
| Curculionidae | †Archaeoheilus | †A. packardii (Scudder, 1893) | Lake Gosiute | 1 specimen | A Molytini tribe molytine weevil. First named as Hylobius packardii (1893). |
| Curculionidae | †Archaeoheilus | †A. provectus (Scudder, 1876) | Lake Gosiute | 2 specimens | A Molytini tribe molytine weevil. First named as Hylobius provectus (1876). |
| Curculionidae | †Archaeoheilus | †A. scudderi Legalov, 2018 | Lake Uinta | 1 specimen | A Molytini tribe molytine weevil. |
| Curculionidae | †Calandrites | †C. cineratius Scudder, 1893 | Lake Gosiute Lake Unita | 13 specimens | A weevil of uncertain subfamilial affiliation. |
| Curculionidae | †Calandrites | †C. defessus Scudder, 1893 | Lake Gosiute Lake Unita | 4 specimens | A weevil of uncertain subfamilial affiliation. |
| Curculionidae | Ceutorhynchus | †C. degravatus Scudder, 1893 | Lake Unita | 1 specimen | A Ceutorhynchini tribe ceutorhynchine weevil. |
| Curculionidae | "Coniatus" | †"C." refractus Scudder, 1893 | Lake Uinta | | A Tropiphorini tribe entimine weevil of uncertain genus affiliations. |
| Curculionidae | Cossonus | †C. rutus Scudder, 1893 | Lake Unita | 1 specimen | A Cossonini tribe cossonine weevil. |
| Curculionidae | Cryptorhynchus | †C. annosus Scudder, 1893) | Lake Gosiute Lake Unita | 3 specimen | A Cryptorhynchini tribe cryptorhynchine weevil. |
| Curculionidae | Cryptorhynchus | †"C". durus Scudder, 1893) | Lake Unita | 1 specimen | A Tropiphorini tribe entimine weevil of uncertain generic affiliations. |
| Curculionidae | "Dryocoetes" | †"D". carbonarius Scudder, 1876 | Lake Gosiute | 1 specimen | A scolytine bark beetle. Considered as genus and tribe incertae sedis by Legalov (2015). |
| Curculionidae | Entimus | †E. primordialis Scudder, 1876 | Lake Uinta | 1 specimen | An Entimini tribe entimine weevil. |
| Curculionidae | Epicaerus | †E. dilapsus (Scudder, 1893) | Lake Gosiute | 1 specimen | A Geonemini tribe entimine weevil. First named as Phyxelis dilapsus (1893). |
| Curculionidae | Epicaerus | †E. effossus (Scudder, 1876) | Lake Gosiute lake Uinta | numerous | A Geonemini tribe entimine weevil. First named as Eudiagogus effossus (1876). |
| Curculionidae | Epicaerus | †E. eradicatus (Scudder, 1893) | Lake Unita | 3 specimens | A Geonemini tribe entimine weevil. First named as Phyxelis eradicatus (1893). |
| Curculionidae | Epicaerus | †E. evigoratus (Scudder, 1893) | Lake Unita | 3 specimens | A Geonemini tribe entimine weevil. First named as Phyxelis evigoratus (1893). |
| Curculionidae | Epicaerus | †E. exanimis (Scudder, 1876) | Lake Gosiute Lake Unita | numerous | A Geonemini tribe entimine weevil. First named as Eudiagogus exanimis (1876). |
| Curculionidae | Epicaerus | †E. excissus (Scudder, 1893) | Lake Unita | 1 specimen | A Geonemini tribe entimine weevil. First named as Phyxelis excissus (1893). |
| Curculionidae | Epicaerus | †E. fodinarum (Scudder, 1876) | Lake Gosiute | 3 specimens | A Geonemini tribe entimine weevil. First named as Sitona fodinarum (1893). |
| Curculionidae | Epicaerus | †E. saxatilis (Scudder, 1876) | Lake Gosiute Lake Unita | numerous | A Geonemini tribe entimine weevil. First named as Eudiagogus saxatilis (1876). |
| Curculionidae | Epicaerus | †E. subterraneus (Scudder, 1893) | Lake Gosiute Lake Unita | Numerous | A Geonemini tribe entimine weevil. First named as Scythropus subterraneus (1893). |
| Curculionidae | Epicaerus | †E. terrosus (Scudder, 1878) | Lake Gosiute Lake Uinta | 4 specimens | A Geonemini tribe entimine weevil. First named as Eudiagogus terrosus (1878). |
| Curculionidae | Eudiagogus | †E. vossi Legalov, 2018 | Lake Uinta | 1 specimen | A Eudiagogini tribe entimine weevil. |
| Curculionidae | †Extinctocentrinus | †E. brevirostris Legalov, 2018 | Lake Uinta | 1 specimen | An Apostasimerini tribe conoderine weevil. |
| Curculionidae | Geraeus | †G. anvilis Legalov, 2018 | Lake Uinta | 1 specimen | An Apostasimerini tribe conoderine weevil. |
| Curculionidae | Geraeus | †G. diruptus (Scudder, 1893) | Lake Uinta | 1 specimen | An Apostasimerini tribe conoderine weevil. First named as Centrinus diruptus (1893) |
| Curculionidae | Geraeus | †G. fossilis Legalov, 2018 | Lake Uinta | 1 specimen | An Apostasimerini tribe conoderine weevil. |
| Curculionidae | "Gymnetron" | †G. lecontei Scudder, 1878 | Lake Gosiute | 1 specimen | A curculionine weevil of uncertain genus and tribal affilliations. |
| Curculionidae | "Lepyrus" | †L. evictus (Scudder, 1893) | Lake Gosiute | 1 specimen | A Tropiphorini tribe entimine weevil of uncertain genus affiliation. |
| Curculionidae | †Limalophus | †L. compositus (Scudder, 1893) | Lake Gosiute Lake Unita | 3 specimens | A Tropiphorini tribe entimine weevil. |
| Curculionidae | †Limalophus | †L. contractus (Scudder, 1893) | Lake Gosiute | 6 specimens | A Tropiphorini tribe entimine weevil. |
| Curculionidae | †Limalophus | †L. receptus (Scudder, 1893) | Lake Unita | 1 specimen | A Tropiphorini tribe entimine weevil. First named as Artipus receptus (1893). |
| Curculionidae | Listronotus | †L. muratus Scudder, 1890 | Lake Gosiute | 1 specimen | A Listroderini tribe cyclomine weevil. |
| Curculionidae | †Lithogeraeus | †L. anicilla (Scudder, 1893) | Lake Unita | 5 specimens | An Apostasimerini tribe conoderine weevil. First described as Aulobaris ancilla (1893) |
| Curculionidae | †Lithogeraeus | †L. circumscripta (Scudder, 1893) | Lake Unita | 5 specimens | An Apostasimerini tribe conoderine weevil. First described as Aulobaris circumscripta (1893) |
| Curculionidae | †Lithogeraeus | †L. comminuta (Scudder, 1893) | Lake Unita | 4 specimens | An Apostasimerini tribe conoderine weevil. First described as Aulobaris comminuta (1893) |
| Curculionidae | †Lithogeraeus | †L. greenriverensis Legalov, 2018 | Lake Uinta | | An Apostasimerini tribe conoderine weevil. |
| Curculionidae | Mitostylus | †M. abacus (Scudder, 1893) | Lake Unita | 1 specimen | A Sciaphilini tribe entimine weevil. First named as Scythropus abacus (1893). |
| Curculionidae | Mitostylus | †M. obdurefactus (Scudder, 1893) | Lake Unita | 5 specimens | A Sciaphilini tribe entimine weevil. First named as Exomias obdurefactus (1893). |
| Curculionidae | Mitostylus | †M. seculorum (Scudder, 1890) | Lake Gosiute | 1 specimen | A Sciaphilini tribe entimine weevil. First named as Tanymecus seculorum (1890). |
| Curculionidae | Neoptochus | Indeteminate | Lake Unita | 2 specimens | Indeterminate Cyphicerini tribe Entiminae weevil fossils. |
| Curculionidae | Nicentrus | †N. curvirostris Legalov, 2018 | Lake Uinta | 1 specimen | An Apostasimerini tribe conoderine weevil. |
| Curculionidae | Ophryastes | †"O". compactus Scudder, 1878 | Lake Gosiute | 1 specimen | A Tropiphorini tribe entimine weevil. of uncertain genus affinities (2011, 2015). |
| Curculionidae | Ophryastes | †O. grandis Scudder, 1893 | Lake Unita | 1 specimen | A Tropiphorini tribe entimine weevil. Considered nomen dubium (2015). |
| Curculionidae | Ophryastes | †O. petrarum Scudder, 1893 | Lake Unita | 2 specimens | A Tropiphorini tribe entimine weevil. Considered nomen dubium (2011, 2015). |
| Curculionidae | †Ophryastites | †O. digressus Scudder, 1893 | Lake Unita | 1 specimen | A weevil of uncertain tribal affiliation. |
| Curculionidae | †Ophryastites | †O. dispertitus Scudder, 1893 | Lake Unita | 1 specimen | A weevil of uncertain tribal affiliation. |
| Curculionidae | †Otiorhynchites | †O. commutatus Scudder. 1893 | Lake Unita | 1 specimen | A weevil of uncertain subfamilial affiliations. |
| Curculionidae | †Otiorhynchites | †O. fossilis Scudder. 1893 | Fossil Lake | 1 specimen | A weevil of uncertain subfamilial affiliations. |
| Curculionidae | †Otiorhynchites | †O. tysoni Scudder. 1893 | Lake Gosiute Lake Unita | 2 specimens | A weevil of uncertain subfamilial affiliations. |
| Curculionidae | Otiorhynchus | †"O". flaccus Scudder, 1893 | Lake Gosiute | 1 specimen | An Otiorhynchini tribe entimine weevil. Considered genus and subfamily incertae sedis by Legalov (2015). |
| Curculionidae | Otiorhynchus | †O. subteractus Scudder, 1893 | Lake Unita | 1 specimen | An Otiorhynchini tribe entimine weevil. Considered genus incertae sedis by Legalov (2015). |
| Curculionidae | Otiorhynchus | †"O". tumbae (Scudder, 1890) | Lake Gosiute | 1 specimen | An entimine weevil. Considered genus and tribus incertae sedis by Legalov (2015). First named Otiorhynchus dubius (1878) |
| Curculionidae | "Pachylobius" | †"P". compressus Scudder, 1893 | Lake Gosiute Lake Unita | 9 specimens | A weevil elytron of uncertain subfamily and genus affiliations. |
| Curculionidae | "Pachylobius" | †"P". depraedatus Scudder, 1893 | Lake Unita | 4 specimens | A weevil elytron of uncertain subfamily and genus affiliations. |
| Curculionidae | †Palaeomallerus | †P. longirostris Legalov, 2018 | Lake Uinta | 1 specimen | A Palaeomallerini tribe conoderine weevil. |
| Curculionidae | "Phyllobius" | †"P". antecessor Scudder, 1893 | Lake Unita | 1 specimen | A weevil of uncertain subfamily and genus affiliations. |
| Curculionidae | "Phyllobius" | †"P". avus Scudder, 1893 | Lake Gosiute Lake Unita | 3 specimens | A weevil of uncertain subfamily and genus affiliations. |
| Curculionidae | "Phyllobius" | †"P". carcerarius Scudder, 1893 | Lake Unita | 2 specimens | A weevil of uncertain subfamily and genus affiliations. |
| Curculionidae | "Polygraphus" | †"P". wortheni (Scudder, 1876) | Lake Gosiute | 1 specimen | A scolytine bark beetle. Considered genus and tribus incertae sedis by Legalov (2015) |
| Curculionidae | Procas | †P. vinculatus Scudder, 1893 | Lake Unita | 2 specimens | An Erirhinini tribe erirhinine weevil. |
| Curculionidae | †Primocentron | †P. wickhami Legalov, 2018 | Lake Uinta | 1 specimen | An Eustylini tribe entimine weevil. |
| Curculionidae | †Pseudophaops | †P. perditus (Scudder, 1876) | Lake Gosiute | 2 specimens | A Eustylini tribe entimine weevil. First named Otiorhynchus perditus (1876) |
| Curculionidae | †Pseudophaops | †P. wickhami Legalov, 2018 | Lake Uinta | | A Tropiphorini tribe entimine weevil. |
| Curculionidae | "Rhyssomatus" | †"R". tabescens Scudder, 1893 | Lake Unita | 1 specimen | A weevil of uncertain generic affiliations. |
| Curculionidae | †Sciabregma | †S. rugosa Scudder, 1893 | Lake Unita | 1 specimen | A Sciabregmini tribe molytine weevil. |
| Curculionidae | †Sciabregma | †S. tenuicornis Cockerell, 1921 | Lake Unita | | A Sciabregmini tribe molytine weevil. |
| Curculionidae | †Scythropus | †S. somniculosus Scudder, 1893 | Lake Unita | 1 specimen | A weevil of uncertain subfamilial affiliations. |
| Curculionidae | "Sitona" | †"S". paginarum Scudder, 1893 | Lake Gosiute Lake Unita | 4 specimens | A Tropiphorini tribe entimine weevil of uncertain genus affiliations. |
| Curculionidae | †Steganus | †S. barrandei Scudder, 1893 | Lake Unita | 1 specimen | A conoderine weevil. |
| Curculionidae | †Syntomostylus | †S. rudis Scudder, 1893 | Lake Unita | 3 specimens | A weevil of uncertain subfamilial affiliations. |
| Curculionidae | "Trypodendron" | †"T". impressus (Scudder, 1876) | Lake Gosiute | 4 specimens | A scolytine bark beetle. Considered genus and tribus incertae sedis by Legalov (2015) Jr synonym includes Dryocoetes impressus (1878 in paleontology) |
| Erotylidae | Tritoma | †T. binotata Scudder, 1878 | Lake Gosiute | 1 specimen | A Tritomini tribe erotyline pleasing fungus beetle. First named as Mycotretus binotata (1878) |
| Laemophloeidae | Parandrita | †P. vestita Scudder, 1890 | Lake Gosiute | 4 specimens | A lined flat bark beetle. |
| Melandryidae | †Cicindelopsis | †C. eophilus Cockerell, 1921 | Lake Unita | | A false darkling beetle. |
| Mordellidae | †Petrimordella | †P. priscula (Cockerell, 1924) | | 1 specimen | A tumbling flower beetle morphospecies. First named as Mordella priscula (1925). |
| Mordellidae | †Petrimordella | †P. rasnitsyni (Odnosum & Perkovsky, 2016) | | 1 specimen | A tumbling flower beetle morphospecies. First named as Isotrilophus rasnitsyni (2016). |
| Nemonychidae | †Eocaenonemonyx | †E. kuscheli Legalov, 2013 | Lake Unita | | An Eocaenonemonychini tribe cretonemonychine pine flower weevil. |
| Nemonychidae | †"Eugnamptus" | †"E". decemsatus Scudder, 1878 | Lake Gosiute | 1 specimen | An Eocaenonemonychini tribe cretonemonychine pine flower weevil. In need of redescription per Legalov (2013). |
| Nemonychidae | †"Eugnamptus" | †"E". grandaevus (Scudder, 1876) | Lake Gosiute | 3 specimens | An Eocaenonemonychini tribe cretonemonychine pine flower weevil. First named as Sitona grandaevus (1876) In need of redescription per Legalov (2013). |
| Peltidae | "Phenolia" | †"P." incapax Scudder, 1876 | Lake Gosiute | 1 specimen | A possible sheild beetle in need of redescription. First placed as a Nitidulid sap beetle. |

##### Polyphaga - Scarabaeiformia

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Scarabaeidae | Aegialia | †A. rupta Scudder, 1890 | Lake Gosiute | 1 specimen | An aegialiine scaraboid beetle. | |
| Scarabaeidae | Phyllophaga | †P. avus (Cockerell), Wickham, 1927 | Lake Unita | 1 specimen | A melolonthine scaraboid beetle. First described as Melolonthites avus (1921) | |

##### Polyphaga - Staphyliniformia

| Family | Genus | Species | Member | Abundance | Notes |
| Hydrophilidae | Berosus | †B. sexstriatus Scudder, 1878 | Lake Gosiute | 1 specimen | A Berosini tribe hydrophiline water scavenger beetle. |
| Hydrophilidae | Berosus | †B. tenuis Scudder, 1878 | Lake Gosiute | 1 specimen | A Berosini tribe hydrophiline water scavenger beetle. |
| Hydrophilidae | Enochrus | †E. primaevus (Scudder, 1878) | Lake Gosiute | 1 specimen | An enochrine water scavenger beetle. First named as Philhydrus primaevus (1878). |
| Hydrophilidae | Hydrobius | †H. confixus Scudder, 1890 | Lake Gosiute | 1 specimen | A Hydrobiusini tribe hydrophiline water scavenger beetle. |
| Hydrophilidae | Hydrobius | †H. decineratus Scudder, 1878 | Lake Gosiute | 1 specimen | A Hydrobiusini tribe hydrophiline water scavenger beetle. |
| Hydrophilidae | Hydrochus | †H. relictus Scudder, 1890 | Lake Gosiute | 1 specimen | A hydrochine water scavenger beetle. |
| Hydrophilidae | Laccobius | †L. elongatus Scudder, 1878 | Lake Gosiute | 1 specimen | A Laccobiini tribe hydrophiline water scavenger beetle. |
| Hydrophilidae | Tropisternus | †T. saxialis Scudder, 1878 | Lake Gosiute | 1 specimen | A Hydrophilini tribe hydrophiline water scavenger beetle. |
| Hydrophilidae | Tropisternus | †T. sculptilis Scudder, 1878 | Lake Gosiute | 1 specimen | A Hydrophilini tribe hydrophiline water scavenger beetle. |
| Staphylinidae | Bledius | †B. adamus Scudder, 1878 | Lake Gosiute | 1 specimen | A Blediini tribe oxyteline rove beetle. |
| Staphylinidae | Bolitogyrus | Undescribed | Lake Unita | 1 specimen | A Staphylinini tribe staphylinine rove beetle. |
| Staphylinidae | Gyrophaena | †G. saxicola Scudder, 1876 | Lake Unita | | A Homalotini tribe aleocharine rove beetle. |
| Staphylinidae | Homalota | †H. recisa Scudder, 1890 | Lake Gosiute | 2 specimens | A Homalotini tribe aleocharine rove beetle. |
| Staphylinidae | Lathrobium | †L. abscessum Scudder, 1876 | Lake Gosiute | 7 specimens | A Lathrobiini tribe paederine rove beetle. |
| Staphylinidae | Leistotrophus | †L. patriarchicus Scudder, 1876 | Lake Unita | 1 specimen | A Staphylinini tribe staphylinine rove beetle. |
| Staphylinidae | Oxytelus | †O. pristinus Scudder, 1876 | Lake Unita | 1 specimen | A Oxytelini tribe oxyteline rove beetle. |
| Staphylinidae | †Staphylinites | †S. obsoletum Scudder, 1876 | Lake Gosiute | 1 specimen | A rove beetle of uncertain subfamily affiliations. |

#### Dictyoptera

| Family | Genus | Species | Member | Abundance | Notes |
| Alienopteridae | †Chimaeroblattina | †C. brevipes Barna, 2018 | Lake Unita | | An alienopterid Dictyopteran. |
| Alienopteridae | †Grant | †G. viridifluvius Aristov, 2018 | Lake Unita | | An alienopterid Dictyopteran. |
| Blattidae | Periplaneta | †P.? smithiae Barna, Zelagin & Šmídová, 2023 | Lake Uinta (Parachute Creek) | 1 specimen | A possible periplanetean blattid cockroach. |
| Blaberidae | Diploptera | †D. gemini Barna, 2016 | Lake Unita | | A Diplopterine beetle cockroache. |
| Blaberidae | Diploptera | †D. savba Šmídová, 2016 | Lake Unita | | A Diplopterine beetle cockroache. |
| Blaberidae | Diploptera | †D. vladimir Vršanský, 2016 | Lake Unita | | A Diplopterine beetle cockroache. |
| Ectobiidae | Cariblattoides | †C. labandeirai Vršanský et al., 2012 | Lake Uinta | | A Pseudophyllodromiine wood cockroach. |
| Ectobiidae | Ectobius | †E. kohlsi Vršanský et al., 2014 | Lake Unita | | An ectobiine Ectobiid cockroach. |

#### Diptera

| Family | Genus | Species | Member | Abundance | Notes |
| Anisopodidae | Mycetobia | †"M." terricola (Scudder, 1878) | Lake Gosiute | 1 specimen | A wood gnat. First described as Diadocidia? terricola Considered nomen dubium in (2019) |
| Anisopodidae | †Olbiogaster | †O. simplex (Cockerell, 1921) | Lake Unita | | A olbiogastrine wood gnat. First described as Eothereva simplex (1921) |
| Anisopodidae | Sylvicola | †S. cadaver Scudder, 1890 | Lake Gosiute | 1 specimen | A anisopodine wood gnat. First named as Asarcomyia cadaver (1890) |
| Asilidae | Asilus | †A. palaeolestes Cockerell, 1921 | Lake Unita | | An Asilini tribe asiline robber fly. |
| Asilidae | †Stenocinclis | †S. anomala Scudder, 1878 | Lake Gosiute | 1 specimen | A dasypogonine robber fly. |
| Anthomyiidae | Anthomyia | †"A." winchesteri Cockerell, 1921 | Lake Unita | | First described as an anthomyiid fly. Deemed nomen dubium without evidence in 1996. |
| Bibionidae | Plecia | †P. akerionana Fitzgerald, 1999 | Lake Unita (Parachute Creek Member) | 1 specimen | A bibonid marchfly. The smallest species from the formation. |
| Bibionidae | Plecia | †P. dejecta Scudder, 1890 | Lake Gosiute | 1 specimen | A bibonid marchfly. |
| Bibionidae | Plecia | †P. pealei Scudder, 1890 | Fossil Lake (Fossil Butte Member) | Most common insect in Fossil Lake | A bibonid marchfly. |
| Bibionidae | Plecia | †P. rhodopterina Cockerell, 1925 | Lake Unita | | A bibonid marchfly. |
| Bibionidae | Plecia | †P. winchesteri Cockerell, 1917 | Lake Unita | | A bibonid marchfly. |
| Bibionidae | Plecia | †P. woodruffi Cockerell, 1916 | Lake Unita | | A bibonid marchfly. |
| Blephariceridae | †Philorites | †P. pallescens Cockerell, 1921 | Lake Unita | | A net-winged midge of uncertain subfamily affinities. |
| Chaoboridae | "Corethra"? | †"C".? exita Scudder, 1877 | Lake Unita | 1 specimen | A phantom midge of uncertain genus affinities. In need of redescription. |
| Chironomidae | Chironomus | †C. depletus Scudder, 1877 | Lake Unita | 1 specimen | A Chironomini tribe chironomine nonbiting midge. |
| Chironomidae | Chironomus | †C. patens Scudder, 1877 | Lake Unita | 1 specimen | A Chironomini tribe chironomine nonbiting midge. |
| Chironomidae | Chironomus | †C. septus Scudder, 1890 | Lake Gosiute | 1 specimen | A Chironomini tribe chironomine nonbiting midge. |
| Chironomidae | Undescribed | Undescribed | Lake Unita | Numerous | undescribed midge larvae. |
| Culicidae | Culex | †C. damnatorum Scudder, 1890 | Lake Gosiute | 3 specimens | A Culicini tribe culicine mosquito. |
| Culicidae | Culex | †C. winchesteri Cockerell, 1919 | Lake Unita | | A Culicini tribe culicine mosquito. |
| Cylindrotomidae | Cylindrotoma | †C. veterana Cockerell, 1921 | Lake Unita | | A cylindrotomine long bodied cranefly. |
| Cylindrotomidae | †Cyttaromyia | †C. fenestrata Scudder, 1877 | Lake Unita | 1 specimen | A cylindrotomine long bodied cranefly species. |
| Cylindrotomidae | †Cyttaromyia | †C. freiwaldi Cockerell, 1925 | Lake Unita | 2 specimens | A cylindrotomine long bodied cranefly species. |
| Cylindrotomidae | †Cyttaromyia | †C. fuscula (Cockerell, 1921) | Lake Unita | 1 specimen | A cylindrotomine long bodied cranefly species. First described as Asilopsis fusculus (1921). |
| Cylindrotomidae | †Cyttaromyia | †C. gelhausi Kania-Kłosok et al., 2021 | Lake Unita | 3 specimens | A cylindrotomine long bodied cranefly species. |
| Cylindrotomidae | †Cyttaromyia | †C. obdurescens Cockerell, 1925 | Lake Unita | 1 specimen | A cylindrotomine long bodied cranefly species. |
| Cylindrotomidae | †Cyttaromyia | †C. reclusa Cockerell, 1924 | Lake Unita | 1 specimen | A cylindrotomine long bodied cranefly species. |
| Dolichopodidae | Dolichopus | indeterminate | Lake Gosiute | 1 specimen | An indeterminate dolichopodine long-legged fly. |
| Empididae | †Protoedalea | †P. brachystoma Cockerell, 1921 | Lake Uinta | | A balloon fly of uncertain subfamily affinity. |
| Empididae | Rhamphomyia | †R. enena Cockerell, 1921 | Lake Unita | | An Empidini tribe empidine balloon fly. |
| Heleomyzidae | Heteromyza | †H. detecta Scudder, 1877 | Lake Unita | 1 specimen | A heleomyzine Heleomyzid fly. |
| Hippoboscidae | †Eornithoica | †E. grimaldii Nel, Garrouste & Engel, 2023 | Fossil Lake (Fossil Butte Member) | 1 specimen | A Hippoboscoidea fly Pupipara. |
| Keroplatidae | Palaeoplatyura | †P. eocenica Cockerell, 1921 | Lake Uinta | | An Orfeliini tribe keroplatine predatory fungus gnat. |
| Limoniidae | Dicranomyia | †D. primitiva Scudder, 1877 | Lake Unita | 4 specimens | A limoniine limoniid cranefly. |
| Limoniidae | Dicranomyia | †D. rostrata Scudder, 1877 | Lake Unita | 2 specimens | A limoniine limoniid cranefly. Includes Tipula decrepita (1877). |
| Limoniidae | Dicranomyia | †D. stigmosa Scudder, 1877 | Lake Unita | 6 specimens | A limoniine limoniid cranefly. Includes Tipula tecta (1877). |
| Limoniidae | †Pronophlebia | †P. rediviva Scudder, 1877 | Lake Unita | 1 specimen | A limoniid cranefly of uncertain subfamily placement. |
| Limoniidae | Rhabdomastix | †R. scudderi (Cockerell, 1921) | Lake Unita | | A chioneine limoniid cranefly. First named as Gonomyia scudderi (1921). |
| Mycetophilidae | Anatella | †A. tacita Scudder, 1890 | Lake Gosiute | 1 specimen | An Exechiini tribe mycetophiline fungus gnat. |
| Mycetophilidae | Boletina | †B. paludivaga Scudder, 1890 | Lake Gosiute | 1 specimen | A gnoristine fungus gnat. |
| Mycetophilidae | Boletina | †B. umbratica Scudder, 1890 | Lake Gosiute | 1 specimen | A gnoristine fungus gnat. |
| Mycetophilidae | Gnoriste | †G. dentoni Scudder, 1877 | Lake Unita | 1 specimen | A gnoristine fungus gnat. |
| Mycetophilidae | Leptomorphus | †L. palaeospilus (Cockerell, 1921) | Lake Unita | | A sciophiline fungus gnat. First named as Diomonus palaeospilus. |
| Mycetophilidae | Mycetophila | †M. occultata Scudder, 1877 | Lake Unita | 1 specimen | A Mycetophilini tribe Mycetophiline fungus gnat. |
| Mycetophilidae | Rymosia | †R. strangulata Scudder, 1890 | Lake Gosiute | 1 specimen | An Exechiini tribe mycetophiline fungus gnat. |
| Mycetophilidae | †Sackenia | †S. arcuata Scudder, 1877 | Lake Unita | 2 specimens | A Mycetophiline fungus gnat. |
| Mycetophilidae | †Sackenia | †S. gibbosa Cockerell, 1907 | Lake Gosiute | | A Mycetophiline fungus gnat. |
| Mycetophilidae | Sciophila | S. hyattii Scudder, 1890 | Lake Gosiute | 1 specimen | A sciophiline fungus gnat. |
| Mycetophilidae | Undescribed | Undescribed | Lake Unita | Numerous | undescribed larvae. |
| Mythicomyiidae | "Acrocera" | †A. hirsuta Scudder, 1877 | Lake Unita | 1 specimen | A mythicomyiid fly of uncertain generic affinities. In need of redescription. |
| Mythicomyiidae | Reissa | †R. kohlsi Evenhuis, 2019 | | | A mythicomyiine mythicomyiid fly |
| Oestridae | Cuterebra | †C. ascarides (Scudder, 1877) | Lake Unita | Numerous | A cuterebrine bot fly species. First named as Musca ascarides (1877) Moved from Lithohypoderma ascarides (1916) |
| Oestridae | Cuterebra | †C. bibosa (Scudder, 1877) | Lake Unita | 1 specimen | A cuterebrine bot fly species. First named as Musca bibosa (1877) |
| Oestridae | Dermatobia | †D. hydropica (Scudder, 1877) | Lake Unita | 3 specimens | A cuterebrine bot fly. First named as Musca hydropica (1877). |
| Platypezidae | Callomyia | †C. torporata Scudder, 1890 | Lake Gosiute | 1 specimen | A flat footed fly. |
| Stratiomyidae | †Lithophysa | †L. tumulta Scudder, 1890 | Lake Gosiute | 1 specimen | A soldier fly. |
| Stratiomyidae | Nemotelus | †N. eocenicus Cockerell, 1921 | Lake Unita | | A soldier fly. |
| Stratiomyidae | Odontomyia | Undescribed | Lake Unita | Numerous | undescribed soldier fly larvae. |
| Stratiomyidae | Sargus | †S. vetus Cockerell, 1921 | Lake Unita | | A soldier fly. |
| Psychodidae | "Culex" | †"C." proavitus Scudder, 1877 | Lake Untia | 1 specimen | A psychodid fly in need of redescription. First described as a mosquito (1877). |
| Sciaridae | Sciara | S. scopuli Scudder, 1890 | Lake Gosiute | 1 specimen | A sciarine dark-winged fungus gnat. |
| Sciomyzidae | †Sciomyza? | †S.? disjecta Scudder, 1878 | Lake Gosiute | Numerous | A Sciomyzini tribe sciomyzine marsh fly. |
| Sciomyzidae | †Sciomyza? | †S.? manca Scudder, 1878 | Lake Gosiute Lake Unita | Numerous | A Sciomyzini tribe sciomyzine marsh fly. |
| Syrphidae | Asarkina | †A. quadrata (Scudder, 1878) | Lake Gosiute | 1 specimen | A Syrphini tribe syrphine hoverfly. First described as Milesia quadrata (1878) |
| Syrphidae | Cheilosia | †C. ampla Scudder, 1877 | Lake Gosiute | 3 specimens | A Rhingiini tribe eristaline hoverfly. |
| Syrphidae | Eristalis | †E. lapideus Scudder, 1877 | Lake Unita | 1 specimen | An Eristalini tribe eristaline hoverfly. |
| Syrphidae | Psilota | †P. tabidosa Scudder, 1890 | Lake Gossiute | 1 specimen | A Merodontini tribe eristaline hoverfly. |
| Syrphidae | Syrphus | †S. eocenicus Cockerell, 1925 | Lake Uinta | | A Syrphini tribe syrphine hoverfly. |
| Syrphidae | Syrphus | †S. lithaphidis Cockerell, 1921 | Lake Unita | | A Syrphini tribe syrphine hoverfly. |
| Syrphidae | Undescribed | Undescribed | Lake Unita | Numerous | undescribed hoverfly larvae. |
| Tabanidae | Undescribed | Undescribed | Lake Unita | Numerous | undescribed larvae. |
| Tachinidae | Tachina | indeterminate | Lake Gosiute | 1 specimen | A Tachinini tribe tachinine Tachinid fly. |
| Tipulidae | †Spiladomyia | †S. simplex (Scudder, 1877) | Lake Unita | 1 specimen | A tipulid cranefly of uncertain subfamily affinities. |
| Tipulidae | Tipula | †T. americana Kania et al., 2018 | Lake Unita | 1 specimen | A tipuline tipulid cranefly. |
| Tipulidae | Tipula | †T. sepulchri Scudder, 1890 | Lake Gosiute | 1 specimen | A tipuline tipulid cranefly. |
| Tipulidae | Tipula | †T. spoliata Scudder, 1890 | Lake Gosiute | 3 specimens | A tipuline tipulid cranefly. |
| Incertae sedis | †Acanthomyites | †A. aldrichi Cockerell, 1921 | Lake Unita | | A brachyceran fly of uncertain family affinities. First treated as a house fly. |
| Incertae sedis | "Lasioptera" | †"L". recessa Scudder, 1877 | Lake Unita | 1 specimen | A sciaroid midge of uncertain genus or family affiliation. First placed as a gall midge. |
| Incertae sedis | †Lithomyza | †L. condita Scudder, 1877 | Lake Unita | 1 specimen | A sciaroid midge of uncertain family affiliation. First placed as a gall midge. |
| Incertae sedis | †Poliomyia | †P. recta Scudder, 1878 | Lake Gosiute | 1 specimen | A schizophoran fly of uncertain affinities. |
| Incertae sedis | †Vinculomusca | †V. vinculata (Scudder, 1877) | Lake Unita | "Several" | A fly pupal case morphospecies of uncertain affinity. First named as Musca vinculata (1877) |

#### Hemiptera

| Family | Genus | Species | Member | Abundance | Notes |
| Aphididae | †?Siphonophoroides | †?S. antiqua Buckton, 1883 | Lake Gosiute | 1 specimen | A possible drepanosiphine aphid. First identified as possibly Lithaphis diruta (1890) |
| Cercopidae | Cercopis | †C. astricta Scudder, 1890 | Lake Gosiute | 1 specimen | A Cercopini tribe cercopine froghopper. |
| Cercopidae | Cercopis | †C. cephalinus Cockerell, 1921 | Lake Unita | | A Cercopini tribe cercopine froghopper. |
| Cercopidae | †Cercopites | †C. calliscens scudder, 1890 | Lake Gosiute | 1 specimen | A froghopper of uncertain subfamilial affiliation. |
| Cercopidae | †Cercopites | †C. umbratilis scudder, 1890 | Lake Gosiute | 1 specimen | A froghopper of uncertain subfamilial affiliation. |
| Cercopidae | †Palecphora | †P. patefacta Scudder, 1890 | Lake Gosiute | 1 specimen | A froghopper of uncertain subfamilial affiliation. |
| Cicadellidae | Aphrodes | †A. adae (SCudder, 1878) | Lake Gosiute | 2 specimens | An Aphrodini tribe aphrodine leafhopper. First named as Acocephalus adae (1878). |
| Cicadellidae | Cicadella | †C. parobtecta Dmitriev, 2020 | Lake Unita | 1 specimen | A Cicadellini tribe cicadelline leafhopper. A replacement name for Tettigonia obtecta (1877 non-Fabricius, 1803) |
| Cicadellidae | Cicadella | †C. priscomarginata (Scudder, 1890) | Lake Gosiute | 1 specimen | A Cicadellini tribe cicadelline leafhopper. First named as Tettigonia priscomarginata (1890). |
| Cicadellidae | Cicadella | †C. priscovariegata Scudder, 1890 | Lake Gosiute | 1 specimen | A Cicadellini tribe cicadelline leafhopper. First named as Tettigonia priscovariegata (1890). |
| Cicadellidae | Cicadella | †C. scudderi Cockerell, 1921 | Lake Unita | | A Cicadellini tribe cicadelline leafhopper. |
| Cicadellidae | Cicadula | †C. saxosa Scudder, 1890 | Lake Gosiute | 1 specimen | A Cicadulini tribe deltocephaline leafhopper. |
| Cicadellidae | Coelidia | †C. wyomingensis Scudder, 1890 | Fossil Lake (Fossil Butte Member) | 1 specimen | A Coelidiini tribe coelidiine leafhopper. |
| Cicadellidae | Iassus | †I. lapidescens (Scudder, 1877) | Lake Uinta | 1 specimen | An Iassini tribe iassine leafhopper. First named as Bythoscopus lapidescens (1877) |
| Cicadellidae | Thamnotettix | †T. gannetti Scudder, 1890 | Lake Gosiute | 2 specimens | An Athysanini tribe deltocephaline leafhopper. |
| Cicadellidae | Thamnotettix | †T. mutilata Scudder, 1890 | Lake Gosiute | 1 specimen | An Athysanini tribe deltocephaline leafhopper. |
| Cicadellidae | Thamnotettix | †T. packardi Cockerell, 1925 | Lake Unita | 2 specimens | An Athysanini tribe deltocephaline leafhopper. |
| Cixiidae | Cixius | †C.? hesperidum Scudder, 1878 | Lake Gosiute | 1 specimen | A possible Cixiini tribe cixiine cixiid planthopper. Considered nomen dubium by Swedo and Lefebvre (2004). |
| Cixiidae | †Oliarites | †O. terrentula (Scudder, 1878) | Lake Gosiute | 1 specimen | A cixiine cixiid planthopper. First named as Mnemosyne terrentula (1878) Considered nomen dubium by Swedo and Lefebvre (2004). |
| Cydnidae | Cyrtomenus | †C. concinnus Scudder, 1878 | Lake Gosiute | 1 specimen | A Geotomini tribe cydnine burrowing bug. |
| Cydnidae | †Necrocydnus | †N. gosiutensis Scudder, 1890 | Lake Gosiute | 1 specimen | A burrowing bug of uncertain subfamilial affiliation. |
| Cydnidae | †Procydnus | †P. mamillanus (Scudder, 1878) | Lake Gosiute | 1 specimen | A cydnine burrowing bug. First named as Cydnus? mamillanus (1878). |
| Cydnidae | †Stenopelta | ↑S. punctulata (Scudder, 1878) | Lake Gosiute | 5 specimens | A cydnine burrowing bug. First named as Aethus punctulatus (1878). |
| Delphacidae | Delphax | †D. veterum Cockerell, 1921 | Lake Uinta | | A Delphacini tribe delphacine delphacid froghopper |
| Dinidoridae | †Dinidorites | †D. margiformis Cockerell, 1921 | Lake Unita | | A dinidorid shield bug of uncertain subfamily affinities. |
| Fulgoridae | Aphaena | †A. atava Scudder, 1877 | Lake Unita | 1 specimen | A lanternfly of uncertain subfamily affiliations First named as Aphana atava (1877) |
| Fulgoridae | Aphaena | †A. rotundipennis Scudder, 1878 | Lake Gosiute | 2 specimens | A lanternfly of uncertain subfamily affiliations First named as Aphana rotundipennis (1878) |
| Fulgoridae | Fulgora | †F. granulosa Scudder, 1878 | Lake Gosiute | 1 specimen | A Fulgorini tribe fulgorine lanternfly. |
| Fulgoridae | Fulgora | †F. populata Scudder, 1890 | Lake Gosiute | 1 specimen | A Fulgorini tribe fulgorine lanternfly. |
| Fulgoridae | Lystra? | †L.? leei Scudder, 1878 | Lake Gosiute | 1 specimen | A Lystrini tribe poiocerine lanternfly. |
| Fulgoridae | Lystra? | †L.? richardsoni Scudder, 1878 | Lake Gosiute | 11 specimens | A Lystrini tribe poiocerine lanternfly. |
| Gerridae | †Telmatrechus | †T. parallelus Scudder, 1890 | Fossil Lake (Fossil Butte Member) Lake Uinta (Laney Member) | 2 specimens | A water strider. |
| Lophopidae | †Scoparidea | †S. nebulosa Cockerell, 1921 | Lake Unita | | A lophopid planthopper. |
| Lyctocoridae | Lyctocoris | †L. terreus (Scudder, 1878) | Lake Gosiute | 1 specimen | A Lyctocorini tribe lyctocorine Lyctocorid bug. First named as Rhyparochromus? terreus (1878) |
| Nogodinidae | †Detyopsis | †D. scudderi Cockerell, 1921 | Lake Unita | | A nogodinid planthopper. |
| Nogodinidae | †Detyopsis | †D. scudderi Cockerell, 1921 | Lake Unita | | A nogodinid planthopper. |
| Nogodinidae | †Ficarasites | †F. stigmaticum Scudder, 1890 | Lake Gosiute | 1 specimen | A nogodinid planthopper. |
| Nogodinidae | †Lithopsis | †L. delicata Cockerell, 1921 | Lake Unita | | A nogodinid planthopper. |
| Nogodinidae | †Lithopsis | †L. elongata Scudder, 1890 | Lake Gosiute | 1 specimen | A nogodinid planthopper. |
| Nogodinidae | †Lithopsis | †L. fimbriata Scudder, 1878 | Lake Gosiute | 3 specimens | A nogodinid planthopper. |
| Nogodinidae | †Lithopsis | †L. simillima Cockerell, 1921 | Lake Unita | | A nogodinid planthopper. |
| Nogodinidae | "Paralatindia" | †"P." saussurei Scudder, 1890 | Lake Gosiute | 1 specimen | A nogodinid planthopper. First described as a Paralatindia genus cockroach. Considered nomen dubium by Shcherbakov (2006) |
| Reduviidae | †Aphelicophontes | †A. danjuddi Swanson et al., 2021 | Lake Unita | 1 specimen | A Harpactorini tribe Harpactorine Assassin bug. |
| Rhopalidae | Corizus | †C. guttatus (Scudder, 1878) | Lake Gosiute | 2 specimens | A Rhopalini tribe rhopaline scentless plant bug. First named as Reduvius guttatus (1878). |
| Rhyparochromidae | Aphanus | †A. petrensis Scudder, 1877 | Lake Unita | 1 specimen | A Gonianotini tribe rhyparochromine seed bug. First named as Pachymerus petrensis (1877). |
| Rhyparochromidae | Cholula | †C. triguttata Scudder, 1890 | Lake Gosiute | 1 specimen | A Myodochini tribe rhyparochromine seed bug. |
| Ricaniidae | †Dilaropsis | †D. ornatus Cockerell, 1921 | Lake Unita | | A Ricaniid plant hopper. |
| Ricaniidae | †Hammapteryx | †H.? ceryniiformis Cockerell, 1921 | Lake Unita | | A Ricaniid plant hopper. |
| Ricaniidae | †Hammapteryx | †H.? lepidoides Cockerell, 1921 | Lake Unita | | A Ricaniid plant hopper. |
| Ricaniidae | †Hammapteryx | †H. reticulata Scudder, 1890 | Lake Gosiute | 1 specimen | A Ricaniid plant hopper. |
| Tingidae | †Gyaclavator | †G. kohlsi Wappler et al., 2015 | Lake Unita | 4 specimens | A lace bug of uncertain subfamily affiliation. |
| Incertae sedis | "Delphax" | †"D." senilis Scudder, 1877 | Lake Unita | 1 specimen | First described as an delphacine froghopper. Considered nomen dubium |
| Incertae sedis | †Diaplegma | †D. obdormitum Scudder, 1890 | Lake Gosiute | 1 specimen | A fulgoroid leafhopper of uncertain familial affinities. First placed as a cixiid planthopper. |
| Incertae sedis | Emiliana | †E. alexandri Shcherbakov, 2006 | Lake Unita | 1 specimen | A fulgoroid leafhopper of uncertain familial affinities. First placed as a Tropiduchid froghopper |
| Incertae sedis | †Eoliarus | †E. lutensis (Scudder, 1890) | Lake Gosiute | 1 specimen | A fulgoroid leafhopper of uncertain familial affinities. First described as Oliarus lutensis (1890) |
| Incertae sedis | †Eoliarus | †E. quadristictus Cockerell, 1925 | Lake Unita | 1 specimen | A fulgoroid leafhopper of uncertain familial affinities. |
| Incertae sedis | †Necygonus | †N. rotundatus Scudder, 1890 | Lake Gosiute | 1 specimen | A Pentatomomorph sheild bug of uncertain familial affiliation. First placed as a toad bug genus. |
| Incertae sedis | †Protoliarus | †P. humatus Cockerell, 1921 | Lake Uinta | | A fulgoroid leafhopper of uncertain familial affinities. First described as a lanternfly. |

#### Hymenoptera

| Family | Genus | Species | Member | Abundance | Notes |
| Apidae | †Euglossopteryx | †E. biesmeijeri De Meulemeester, Michez & Engel, 2014 | Lake Unita (Parachute Creek Member) | | An apid bee. |
| Bethylidae | Eupsenella | E. sp. | | | An old world Bethylidae wasp. |
| Braconidae | Bracon | †B. laminarum Scudder, 1878 | Lake Gosiute | 1 specimen | A Braconini tribe braconine braconid wasp. |
| Braconidae | †Colemanus | †C. keeleyorum Fisher, 2015 | Lake Unita (Parachute Creek Member) | 1 specimen | A Proteropini tribe ichneutine braconid wasp. |
| Braconidae | †Eobracon | †E. cladurus Cockerell, 1921 | Lake Unita | | A braconid wasp of uncertain subfamily affinities. |
| Braconidae | Spathius | †S. petrinus (Scudder, 1877) | Lake Unita | 1 specimen | A Spathiini tribe Doryctine braconid wasp. First named as Ichneumon petrinus (1877) Moved from Hormiopterus petrinus (1910) |
| Eurytomidae | Eurytoma | †E. antiqua (Scudder, 1878) | Lake Gosiute | 2 specimens | An eurytomine Eurytomid chalcid wasp. First described as Decatoma antiqua (1878). |
| Formicidae | †Archimyrmex | †A. rostratus Cockerell, 1923 | Lake Unita | Numerous | A myrmeciine ant. |
| Formicidae | †Camponotites | †C. vetus (Scudder, 1877) | Green River Formation? | 1 specimen | A formicine ant of uncertain affiliation. First described as Camponotus vetus (1877) The type locality was not specified by Scudder, and may Be G.R.F. or White River Formation. |
| Formicidae | Dolichoderus | †D. kohlsi Dlussky & Rasnitsyn, 2003 | Lake Uinta | Numerous | A Dolichoderus species ant. |
| Formicidae | †Eoformica | †E. globularis Dlussky & Rasnitsyn, 2003 | Lake Unita | 2 specimens | An ant of unidentified affiliation. |
| Formicidae | †Eoformica | †E. magna Dlussky & Rasnitsyn, 2003 | Lake Unita | 1 specimen | An ant of unidentified affiliation. |
| Formicidae | †Eoformica | †E. pinguis (Scudder, 1877) | Lake Gosiute Lake Uinta | Numerous | An ant of unidentified affiliation. Moved from Liometopum pingue (1877) Includes the jr synonyms Lasius terreus (1878) and Eoformica eocenica (1921) |
| Formicidae | †Eoformica | Indeterminate | Lake Unita | 2 specimen | Two partial specimens that may be referable to Eoformica. |
| Formicidae | †Kohlsimyrma | †K. gracilis Dlussky & Rasnitsyn, 2003 | Lake Unita | 2 specimens | An ant of uncertain affiliation. |
| Formicidae | †Kohlsimyrma | †K. laticeps Dlussky & Rasnitsyn, 2003 | Lake Unita | 1 specimen | An ant of uncertain affiliation. |
| Formicidae | †Kohlsimyrma | †K. longiceps Dlussky & Rasnitsyn, 2003 | Lake Unita | 3 specimens | An ant of uncertain affiliation. |
| Formicidae | †Mianeuretus | †M. eocenicus Dlussky & Rasnitsyn, 2003 | Lake Unita | 2 specimens | An aneuretine ant. |
| Formicidae | †Mianeuretus | Indeterminate | Lake Unita | 1 specimen | A partial specimen that may belong to Mianeuretus. |
| Formicidae | †Myrmecites | †M. rotundiceps Dlussky & Rasnitsyn, 2003 | Lake Unita | 1 specimen | A myrmicine ant of uncertain affiliation. |
| Formicidae | Pachycondyla | †P. labandeirai Dlussky & Rasnitsyn, 2003 | Lake Gosiute | 1 specimen | A Pachycondyla species ant. |
| Formicidae | †Ponerites | †P. coloradensis Dlussky & Rasnitsyn, 2003 | Lake Unita | 1 specimen | A ponerine ant of uncertain affiliation. |
| Formicidae | †Ponerites | †P. eocenicus Dlussky & Rasnitsyn, 2003 | Lake Unita | 1 specimen | A ponerine ant of uncertain affiliation. |
| Formicidae | †Ponerites | †P. hypoponeroides Dlussky & Rasnitsyn, 2003 | Lake Unita | 1 specimen | A ponerine ant of uncertain affiliation. |
| Formicidae | †Proiridomyrmex | †P. vetulus Dlussky & Rasnitsyn, 2003 | Lake Unita | 1 specimen | A dolichoderine of uncertain affinity. |
| Formicidae | †Proiridomyrmex | Indeterminate | Lake Unita | 1 specimen | A partial specimen that may belong to Proiridomyrmex. |
| Formicidae | †Solenopsites | †S. minutus Dlussky & Rasnitsyn, 2003 | Lake Unita | 1 specimen | A Solenopsis like ant of uncertain affiliation. |
| Formicidae | †Titanomyrma | †T. lubei Archibald et al., 2011 | Fossil Lake (Angelo Member) | 3 specimens | A titan ant species. |
| Formicidae | Indeterminate | Indeterminate | Lake Unita | 1 specimen | A partial ant specimen that may belong to Formica. |
| Formicidae | Indeterminate | Indeterminate | Lake Unita | 3 specimens | Partial ant specimens of unidentified subfamily placement. |
| Ichneumonidae | Allomacrus | †A. lanhami (Cockerell, 1941) | Lake Unita | | A cylloceriine darwin wasp. First named as Plectiscidea lanhami (1941) |
| Ichneumonidae | †Carinibus | †C. molestus Spasojevic et al., 2018 | Lake Unita | 1 specimen | A darwin wasp of uncertain subfamily placement. |
| Ichneumonidae | Eclytus? | †E.? lutatus Scudder, 1890 | Lake Gosiute | 1 specimen | A possible Eclytini tribe tryphonine darwin wasp. |
| Ichneumonidae | †Eopimpla | †E. grandis Cockerell, 1921 | Lake Unita | | A darwin wasp of uncertain subfamily placement. |
| Ichneumonidae | Glypta? | †G.? transversalis Scudder, 1890 | Lake Gosiute? | 1 specimen | A Glyptini tribe banchine darwin wasp. |
| Ichneumonidae | †Ichninsum | †I. appendicrassum Spasojevic et al., 2018 | Lake Unita | 1 specimen | A pimpline darwin wasp. |
| Ichneumonidae | †Lithotorus | †L. cressoni Scudder, 1890 | Lake Gosiute | 1 specimen | An Orthocentrine darwin wasp. |
| Ichneumonidae | Mesoclistus? | †M.? yamataroti Spasojevic et al., 2018 | Lake Unita | 1 specimen | A possible Coleocentrini tribe acaenitine darwin wasp. |
| Ichneumonidae | Pimpla? | †P.? eocenica Cockerell, 1919 | Lake Unita | 1 specimen | A possible Pimplini tribe pimpline darwin wasp. |
| Ichneumonidae | Phygadeuon | †P. petrifactellus Cockerell, 1921 | Lake Uinta | | A Phygadeuontini tribe phygadeuontine darwin wasp. |
| Ichneumonidae | Rhyssa? | †R.? juvenis Scudder, 1890 | Lake Gosiute | 1 specimen | A Rhyssini tribe rhyssine darwin wasp. |
| Ichneumonidae | Scambus? | †S.? mandibularis Spasojevic et al., 2018 | Lake Unita | 1 specimen | A possible Ephialtini tribe pimpline darwin wasp. |
| Ichneumonidae | Scambus? | †S.? parachuti Spasojevic et al., 2018 | Lake Unita | 1 specimen | A possible Ephialtini tribe pimpline darwin wasp. |
| Ichneumonidae | †Tilgidopsis | †T. haesitans Cockerell, 1921 | Lake Unita | | A darwin wasp of uncertain subfamily placement. |
| Ichneumonidae | †Trymectus | †T. amasidis (Cockerell & LeVeque, 1931) | lake Unita | | A darwin wasp of uncertain subfamily placement. First described as Tryphon amasidis (1931) |
| Siricidae | †Eoteredon | †E. lacoi Archibald, Aase & Nel, 2021 | Fossil Lake | 1 specimen | A siricid Horntail wood-wasp. |
| Tenthredinidae | Eutomostethus | †E. karimae Nel, Niu & Wei, 2022 | Lake Unita | | A blennocampine common sawfly. |
| Tenthredinidae | Taxonus | †T. nortoni Scudder, 1890 | Lake Gosiute | 1 specimen | An allantine common sawfly. |
| Vespidae | Alastor | †A. solidescens (Scudder, 1890) | Lake Gosiute | 1 specimen | A eumenine potter wasp. First named as Didineis solidescens (1890). |
| Xyelidae | †Proxyelia | †P. pankowskii Jouault, Aase & Nel, 2021 | Fossil Lake | 1 specimen | A xyelid sawfly |

#### Lepidoptera

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Depressariidae | †Hexerites | †H. primalis Cockerell, 1933 | Lake Unita | 1 specimen | A stenomatine depressariid moth. First placed in the family Thyrididae. | |

#### Mantodea

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Indeterminate | Indeterminate | Indeterminate | | | Undescribed preying mantis specimens | |

#### Megaloptera

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Sialidae | Indeterminate | Indeterminate | | 1 specimen | A probable alderfly larvae | |

#### Neuroptera

| Family | Genus | Species | Member | Abundance | Notes |
| Berothidae | †Xenoberotha | †X. angustialata Makarkin, 2017 | Lake Unita (Parachute Creek Member) | 1 specimen | A berothine beaded lacewing. |
| Hemerobiidae | Megalomus? | †M.? coloradensis Makarkin, 2024 | Lake Unita | | A possible Megalomus brown lacewing. |
| Hemerobiidae | †Pseudonotherobius | †P. kohlsi Makarkin, 2024 | Lake Unita | | A brown lacewing. |
| Mantispidae | †Protonolima | †P. mantispinoformis Makarkin, 2019 | Lake Unita | 1 specimen | A calomantispine mantidfly. |
| Myrmeleontidae | †Epignopholeon | †E. sophiae Makarkin, 2017 | Lake Unita (Parachute Creek Member) | 1 specimen | A probable Gnopholeontini tribe myrmeleontine antlion. |
| Osmylidae | †Osmylidia | †O. taliae Makarkin, Archibald, & Mathewes, 2021 | Lake Unita | 1 specimen | A protosmyline Osmylid lance lacewing |
| Incertae sedis | †Callospilopteron | †C. ocellatum Cockerell, 1921 | | | A lacewing of uncertain affiliation. First identified as an hemipteran planthopper. |

#### Raphidioptera

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Raphidiidae | †Archiinocellia | †A. protomaculata (Engel, 2011) | Lake Unita (Parachute Creek Member) | ca. 18 specimens | A raphidiid snakefly. Moved from Agulla protomaculata (2011) | |

#### Odonata

Primarily based on Bechly et al (2020):
| Family | Genus | Species | Member | Abundance | Notes |
| Amphipterygidae | †Protamphipteryx | P. basalis Cockerell, 1921 | Fossil Lake | | An amphipterygine amphipterygid damselfly. |
| †Carleidae | †Carlea | C. eocenica Bechly et al., 2020 | Fossil Lake | 1 specimen | A carleid damselfly. |
| Cordulibellulidae | †Cordulibellula | C. inopinata Sroka, Howells & Nel, 2023 | Lake Uinta (Parachute Creek) | | A cordulibellulid dragonfly the last member of an ancient lineage. |
| Corduliidae | †Stenogomphus | †S. carletoni Scudder, 1892 | Lake Unita | | A green-eyed skimmer. |
| Corduliidae | †Stenogomphus | †"S." scudderi Cockerell, 1921 | Lake Unita | | First described as a green-eyed skimmer. Deemed nomen dubium in 1994. |
| Dysagrionidae | †Dysagrion | D. fredericii Scudder, 1878 | Lake Gosiute (Laney Member) | 16 specimens | A dysagrionine dysagrionid damselfly. |
| Dysagrionidae | †Dysagrion | D. integrum Bechly et al., 2020 | Fossil Lake (Fossil Butte Member) | 1 specimen | A dysagrionine dysagrionid damselfly. |
| Dysagrionidae | †Dysagrion | D. lakesii Scudder, 1890 | Lake Gosiute (Laney Member) | 1 specimen | A dysagrionine dysagrionid damselfly. |
| Dysagrionidae | †Dysagrion | D. packardii Scudder, 1885 | Lake Gosiute (Laney Member) | 1 specimen | A dysagrionine dysagrionid damselfly. |
| Dysagrionidae | †Petrolestes | †P. hendersoni Cockerell, 1927 | Lake Uinta (Parachute Creek Member) | 1 specimen | A petrolestine dysagrionid damselfly. |
| Dysagrionidae | †Petrolestes | †P. inexpectatus Nel, 2024 | Lake Uinta | 1 specimen | A petrolestine dysagrionid damselfly. |
| Dysagrionidae | †Tenebragrion | †T. tynskyi Nel, Palazzo & Aase, 2023 | Fossil Lake | | A dysagrionid damselfly. |
| Dysagrionidae | †Tenebragrion | †T. shermani Bechly et al., 2020 | Fossil Lake | | A dysagrionid damselfly. |
| Calopterygidae | †Eocalopteryx | E. atavina Cockerell, 1920 | Lake Gosiute | 1 specimen | A calopterygid damsefly. |
| Euphaeidae | †Eodysphaea | E. magnifica Bechly et al., 2020 | Lake Uinta (Parachute Creek) | | A euphaeid damselfly. |
| Euphaeidae | †Epallagites | E. avus Cockerell, 1925 | Lake Unita | 1 specimen | A euphaeid damselfly. |
| Euphaeidae | †Labandeiraia | L. americaborealis Petrulevičius et al., 2007 | Lake Uinta (Parachute Creek) | 1 specimen | A euphaeid damselfly. |
| Euphaeidae | †Labandeiraia | L. riveri Bechly et al., 2020 | Fossil Lake | 1 specimen | A euphaeid damselfly. |
| Euphaeidae | †Litheuphaea | L. coloradensis Petrulevičius et al., 2007 | Lake Uinta (Parachute Creek) | 1 specimen | A euphaeid damselfly. |
| †Eolestidae | †Eolestes | E. syntheticus Cockerell, 1940 | Lake Unita | | An eolestid damselfly. |
| Megapodagrionidae | †Viridiflumineagrion | V. aasei Nel, 2022 | Lake Uinta (Parachute Creek Member) | 1 specimen | A "megapodagrionid" damselfly. |
| Thaumatoneuridae | †Gusagrion | †G. coloratum Nel, 2024 | Lake Uinta | 1 specimen | An eodysagrionine thaumatoneurid damselfly. |
| Thaumatoneuridae | †Oreodysagrion | O. tenebris Bechly et al., 2020 | Fossil Lake | | A thaumatoneurid damselfly. |
| Thaumatoneuridae | †Tynskysagrion | T. brookeae Bechly et al., 2020 | Fossil Lake | | A thaumatoneurid damselfly. |
| †Urolibellulidae | †Kohlslibellula | K. lini Nel, 2020 | Lake Uinta (Parachute Creek) | | A urolibellulid dragonfly |
| †Urolibellulidae | †Urolibellula | U. eocaenica Zeiri et al., 2015 | Lake Uinta (Parachute Creek) | | A urolibellulid dragonfly |
| Zacallitidae | †Zacallites | Z. balli Cockerell, 1928 | | | A zacallitid damselfly. |
| Zacallitidae | †Zacallites | Z. cockerelli Bechly et al., 2020 | Fossil Lake | | A zacallitid damselfly. |
| incertae sedis | †Eopodagrion | "E." abortivum (Scudder, 1878) | Lake Gosiute (Laney Member) | 1 specimen | A damselfly of uncertain affinities. First named as Podagrion abortivum (1878) Deemed nomen dubium by Nel (2022). |
| incertae sedis | †Eopodagrion | E. scudderi Cockerell, 1921 | Lake Gosiute (Laney Member) | 3 specimens | A damselfly of uncertain affinities. |

#### Orthoptera

| Family | Genus | Species | Member | Abundance | Notes |
| Eumastacidae | †Eoerianthus | †E. eocaenicus Gorochov, 2012 | Lake Unita | | A monkey grasshopper. |
| Eumastacidae | †Eoerianthus | †E. multispinosus (Scudder, 1890 | Lake Gosiute | | A monkey grasshopper. First described as Tyrbula multispinosa (1890). |
| Gryllidae | Eogryllus | †E. unicolor Gorochov, 2012 | Lake Unita | | A Gryllini tribe grylline true cricket. |
| Gryllidae | Eogryllus | †E. elongatus Gorochov, 2012 | Lake Unita | | A Gryllini tribe grylline true cricket. Tentatively placed in Eogryllus |
| Gryllidae | †Pronemobius | †P. induratus Scudder, 1890 | Lake Gosiute | | A Gryllini tribe grylline true cricket. |
| Gryllidae | †Pronemobius | †P. ornatipes Cockerell, 1921 | Lake Unita | | A Gryllini tribe grylline true cricket. |
| Gryllidae | †Pronemobius | †P. tertiarius (Scudder, 1878) | Lake Gosiute Lake Unita | | A Gryllini tribe grylline true cricket. Tentatively placed in Pronemobius First described as Nemobius tertiarius (1878). |
| Gryllotalpidae | †Pterotriamescaptor? | †P.? americanus Gorochov, 2012 | Lake Unita | | A gryllotalpine mole cricket. |
| Mogoplistidae | †Eomogoplistes | †E. longipennis Gorochov, 2012 | Lake Unita | | A Mogoplistini tribe Mogoplistine scaly cricket. |
| Mogoplistidae | †Pteromogoplistes | †P. grandis Gorochov, 2012 | Lake Unita | | A Mogoplistini tribe Mogoplistine scaly cricket. |
| Mogoplistidae | †Pteromogoplistes | Indeterminate | Lake Unita | numerous | Indeterminate scaly cricket fossils. |
| Mogoplistidae | †Pteromogoplistes | †P.? smithii (Scudder, 1890) | Lake Unita | | A Mogoplistini tribe Mogoplistine scaly cricket. Tentatively moved from Pronemobius smithii (1890) |
| Phalangopsidae | Eotrella | †E. mira Gorochov, 2012 | Lake Unita | | A phalangopsine spider cricket. |
| Phalangopsidae | Eozacla | †E. arachnomorpha Gorochov, 2012 | Lake Unita | | A phalangopsine spider cricket. |
| Phalangopsidae | Eozacla | †E. problematica Gorochov, 2012 | Lake Unita | | A phalangopsine spider cricket. |
| Tetrigidae | Eotetrix | †E. unicornis Gorochov, 2012 | Lake Unita | | A batrachideine pygmy grasshopper. |
| Tettigoniidae | Arethaea | †A. solterae Heads, Thomas & Hedlund, 2023 | Lake Uinta (Parachute Creek) | 1 specimen | A roundhead katydid. |
| Trigonidiidae | Indeterminate | Indeterminate | Lake Unita | | Indetermiante trigonidiine sword-tail cricket remains. |
| Incertae sedis | †Tettoraptor | †T. maculatus Gorochov, 2012 | Lake Unita | | A Tettigoniid grasshopper of uncertain affiliations. |

#### Psocodea

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Incertae sedis | †Paropsocus | †P. disjunctus Scudder, 1890 | Lake Unita | 1 specimen | A louse of uncertain family affinities. | |

#### Strepsiptera

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Myrmecolacidae | Caenocholax | †C. barkleyi Antell & Kathirithamby, 2016 | Lake Unita (Parachute Creek Member) | 1 specimen | A male twisted-winged insect. | |
| Myrmecolacidae | Caenocholax | †C. palusaxus Antell & Kathirithamby, 2016 | Lake Unita (Parachute Creek Member) | 1 specimen | A male twisted-winged insect. | |

#### Thysanoptera

| Family | Genus | Species | Member | Abundance | Notes |
| Aeolothripidae | †Lithadothrips | †L. vetustus Scudder, 1875 | Lake Uinta | 2 specimens | An Aeolothripid thrips. First named as Lithadothrips vetusta |
| Aeolothripidae | †Palaeothrips | †P. fossilis Scudder, 1867 | Lake Unita | 1 specimen | An Aeolothripid thrips. |
| Melanthripidae | Melanothrips | †M. extincta Scudder, 1875 | Lake Unita | 1 specimen | A melanthripid thrips. |

#### Trichoptera

| Family | Genus | Species | Member | Abundance | Notes |
| Hydropsychidae | Hydropsyche | †H. operta (Scudder, 1877) | Lake Unita | 1 specimen | A hydropsychine net-spinning caddisfly. First named as Phryganea operta (1877) |
| Hydroptilidae | Hydroptila | †H. phileos Cockerell, 1921 | Lake Unita | | A Hydroptilini tribe hydroptiline purse-case caddisfly. |
| Limnephilidae | †Indusia | †I. calculosa Scudder, 1878 | Lake Gosiute? | | A northern caddisfly larval case morphospecies. |
| Limnephilidae | Limnephilus | †L. eocenicus Cockerell, 1921 | Lake Unita | 1 specimen | A northern caddisfly species. |
| Incertae sedis | †Litholimnephilops | †L. yinani Robinson, Thomas & Heads, 2018 | Lake Unita | | A caddis fly of uncertain affiliations. |

## Mollusks

Based on Grande (1984):

### Bivalvia

| Family | Genus | Species | Member | Notes | Image |
| Sphaeriidae | Sphaerium | S. sp. | Lake Gosiute | A fingernail clam. | S. rhomboideum, a modern species |
| Unionidae | Plesielliptio | P. priscus | Lake Gosiute | A unionid river mussel. | |
| Unionidae | Plesielliptio | P. sp. "A" | Lake Gosiute | A unionid river mussel. | |

### Gastropoda

| Family | Genus | Species | Member | Notes |
| Bulimulidae | Oreoconus | O. sp. | ? | An undescribed bulimulid land snail. |
| Gastrocoptidae | Gastrocopta | G. sp. | | An undescribed gastrocoptid land snail. |
| Hydrobiidae | Hydrobia | †H. aff. utahensis C. A. White, 1876 | Lake Gosiute (Laney, Tipton Shale, Wilkins Peak) | An undescribed mud snail. Affiliated to Hydrobia utahensis |
| Hydrobiidae | Hydrobia | H. sp. | Lake Gosiute (Tipton Shale) | An undescribed mud snail. |
| Lymnaeidae | Lymnaea | L. similis Meek, 1860 | Lake Gosiute (Laney) | A pond snail. |
| Lymnaeidae | Lymnaea | L. sp. | Lake Gosiute (Tipton Shale) | A undescribed pond snail. |
| Lymnaeidae | †Pleurolimnaea | P. tenuicosta (Meek & Hayden, 1856) | Lake Gosiute (Tipton Shale?) | A pond snail. First named Limnaea tenuicosta (1856) |
| Planorbidae | Biomphalaria | B. aequalis (C. A. White, 1880) | Lake Gosiute (Laney, Tipton Shale) | A ramshorn snail. |
| Planorbidae | Biomphalaria | B. storchi (L. S. Russell, 1931) | Lake Gosiute (Laney?, Tipton Shale) | A ramshorn snail. |
| Planorbidae | †Headonia | †H. pseudoammonius (Schlotheim, 1820) | Lake Gosiute (Laney, Tipton Shale) | A ramshorn snail First reported as Biomphalaria pseudoammonius (1820) |
| Planorbidae | ?Drepanotrema | ?D. sp. | Lake Gosiute (Laney) | An undescribed ramshorn snail. |
| Planorbidae | Gyraulus | G. militaris (C.A. White, 1880) | Lake Gosiute (Tipton Shale) | A ramshorn snail. |
| Planorbidae | Omalodiscus | †O. cirrus (C. A. White, 1879) | Lake Gosiute (Tipton Shale) | A ramshorn snail. |
| Physidae | Physa | †?P. longiuscula Meek & Hayden, 1856 | Lake Gosiute (Tipton Shale) | An bladder snail. |
| Physidae | Physa | P. sp. | Lake Gosiute (Laney) | An undescribed bladder snail. |
| Physidae | Physella | †P. bridgerensis (Meek, 1873) | Lake Gosiute (Laney, Tipton Shale) | A bladder snail. First named Physa bridgerensis (1873) |
| Physidae | Physella | †P. pleromatis (C. A. White, 1877) | Lake Gosiute (Tipton Shale) | A bladder snail. First named Physa pleromatis (1877) |
| Pleuroceridae | Elimia | †E. tenera (J. Hall, 1845) | Lake Gosiute (Laney, Tipton Shale, Wilkins Peak) | A pleurocerid snail. the most common snail in the formation The source of the famous "Turritella agate". |
| Urocoptidae | Holospira | H. sp. | | An undescribed urocoptid land snail. |
| Valvatidae | Valvata | †V. subumbilicata (Meek & Hayden, 1856) | Lake Gosiute (Laney, Tipton Shale) | A valve snail. |
| Valvatidae | Valvata | Cf. †V. filosa Whiteaves, 1885 | Lake Gosiute (Laney, Tipton Shale) | An undescribed valve snail. Similar to Valvata filosa |
| Viviparidae | Viviparus | †V. meeki Wenz, 1930 | Lake Gosiute (Laney, Tipton Shale) | A river snail. First named Paludina trochiformis (1856 non-von Zieten, 1830) |
| Viviparidae | Viviparus | †V. paludinaeformis (J. Hall, 1845) | Lake Gosiute (Tipton Shale) | A river snail. |

## Fungi

| Genus | Species | Member | Abundance | Notes |
| †Caenomyces | C. eucalypti Knowlton, 1923 | Lake Unita | 1 specimen | A possible ascomycotan leaf spot fungus morphospecies. Hosted on Syzygioides americana leaves. Brown (1934) considered all leaf spots of the formation to be indeterminate †Sphaerites species. First named as Caenomyces eucalyptae. |
| †Caenomyces | †C. planerae R.W. Brown, 1929 | Lake Unita | 1 specimen | A possible ascomycotan leaf spot fungus morphospecies. Hosted on a Cedrelospermum nervosum leaf. Brown (1934) considered all leaf spots of the formation to be indeterminate †Sphaerites species. |
| †Caenomyces | †C. sapindicola Knowlton, 1923 | Lake Unita | 1 specimen | A possible ascomycotan leaf spot fungus morphospecies. Hosted on the Toxicodendron winchesteri holotype leaf. Brown (1934) considered all leaf spots of the formation to be indeterminate †Sphaerites species. |
| †Eoglobella | †E. longipes Bradley, 1931 | Lake Unita | 1 specimen | A Staurosporaen fungal spore of uncertain affiliation. |
| Entophlyctis | †E. willoughbyi Bradley, 1967 | Lake Gosiute (Wilkins Peak Member) | | An aquatic chytridialean fungi. |
| Pleotrachelus | †P. askaulos Bradley, 1967 | Lake Gosiute (Wilkins Peak Member) | | An aquatic chytridialean fungi. |
| †Sphaerites | †S. myricae (Lesquereux) Meschinelli, 1892 | Lake Gosiute | 1 specimen | A possible ascomycotan leaf spot fungus morphospecies. Hosted on a "Rhus" nigricans leaf. First described as Sphaeria myricae (1878) Brown (1934) considered all leaf spots of the formation to be indeterminate †Sphaerites species. |

## Unicellular microbiota
### Cyanobacteria

| Family | Genus | Species | Member | Notes |
| Chroococcaceae | Chroococcus | ?Cf. C. dispersus (Von Keissler) Lemmerman | Lake Unita | An aquatic chroococcacean cyanobacteria. |
| Chroococcaceae | Chroococcus | Cf. C. westii (W. West) P. Boye, 1929 | Lake Unita | An aquatic chroococcacean cyanobacteria. |
| Coleofasciculaceae | Stigonema | †S. anchistina Bradley, 1970 | Lake Gosiute (Wilkins Peak Member) | An aquatic coleofasciculacean cyanobacteria. |
| Coleofasciculaceae | Symploca | †S. hedraia Bradley, 1970 | Lake Gosiute (Wilkins Peak Member) | An aquatic coleofasciculacean cyanobacteria. |
| Gomontiellaceae | Crinalium | ?Cf. C. endophyticum Crow | Lake Unita | An aquatic gomontiellaceous cyanobacteria. |
| Gomontiellaceae | Crinalium | C. sp. | Lake Unita | An aquatic gomontiellaceous cyanobacteria. First identified as Spirulina sp. (1916) |
| Hapalosiphonaceae | Hapalosiphon | H. confervaceus Borzi | Lake Unita | An aquatic hapalosiphonaceous cyanobacteria. |

### Algae

| Family | Genus | Species | Member | Abundance | Notes |
| Chaetophoraceae | Stigeoclonium? | Cf. S.? lubricum (Dillwyn) Kützing | Lake Unita | 1 specimen | A possible chaetophoraceous chlorophyte green algae. |
| Chlorellaceae | †Chlorellopsis | †C. coloniata Reis, 1923 | | numerous | A unicellular stromatolite forming green algae. |
| Chlorellaceae | †Confervites | †C. mantiensis Bradley, 1929 | Lake Uinta (Manti beds) | | A filamentous stromatolite forming green algae. |
| Hydrodictyaceae | Tetraedron | Cf. T. regulare var. torsum (Turner) Brunnthaler | Lake Unita | 1 specimen | A hydrodictyaceous chlorophyte green algae. |
| Microsporaceae | Microspora | Cf. M. pachyderma (Wille) Lagerheim | Lake Unita | 1 specimen | A sphaeroplealean chlorophyte green algae. |
| Oocystaceae | Cf. Eremosphaera | E. sp. | Lake Unita | | An oocystacean chlorophyte green algae. |
| Scenedesmaceae | Coelastrum | Cf. C. verrucosum Retnsch | Lake Unita | | A sphaeroplealean chlorophyte green algae. |
| Schizochlamydaceae | Schizochlamys | †S. haywellensis Bradley, 1970 | Lake Gosiute (Wilkins Peak Member) | | A sphaeroplealean chlorophyte green algae. |

### Charophytes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Zygnemataceae | Spirogyra | †S. wyomingia Bradley, 1970 | Lake Gosiute (Wilkins Peak Member) | | A zygnematacean charophyte green algae. | |

### Euglenozoans

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Phacaceae | Phacus | Cf. P. caudata Hübner, 1886 | | 1 specimen | A Euglenozoan algal flagellate. | |

### Amoebozoans

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Difflugiidae | Difflugia | †D. calcifera Bradley, 931 | Lake Unita | 1 specimen | A difflugiid lobose testate amoeba. | |
| Quadrulidae | Quadrula | †Q. minuta Bradley, 1931 | Lake Unita | 1 specimen | A quadrulid lobose testate amoeba. | |

### Cercozoans

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Euglyphidae | Euglypha | †E. robusticornis Bradley, 1931 | Lake Unita | | A Cercozoan eukaryote. | |

## Plants
### Liverworts

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Jungermanniaceae | †Jungermannites | †J. eophilus (Cockerell) Steere, 1947 | Lake Unita | 1 specimen | A leafy liverwort morphospecies. First described as Lejeunea eophila (1925). | |

### Lycophytes

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Isoetaceae | †Isoetites | †I. horridus (Dawson) R.W. Brown, 1939 | Lake Unita | 1 specimen | An isoetaceous quillwort morphospecies. First described as Carpolithes horridus (1884). | |

### Ferns

| Family | Genus | Species | Member | Abundance | Notes |
| Aspleniaceae | Asplenium | †A. delicatula (R.W. Brown) MacGinitie, 1969 | | | A spleenwort fern leaf morphospecies. First described as Aneimia delicatula (1929) Includes Phyllites furcivena (1934) Jr homonym of Asplenium delicatulum C. Presl, 1825 |
| Aspleniaceae | Asplenium | †A. eoligniticum Berry, 1916 | Lake Unita | 2 specimens | A spleenwort fern leaf morphospecies. |
| Equisetaceae | Equisetum | †E. haydenii Lesquereux, 1872 | Not Green River Formation | | A scouring rush morphospecies. First ascribed to the formation Excluded by Knowlton (1923) as a Washakie Formation species. |
| Equisetaceae | Equisetum | †E. winchesteri Brown, 1929 | Lake Gosiute | 1 specimen | A scouring rush morphospecies. |
| Equisetaceae | Equisetum | †E. wyomingense Lesquereux, 1873 | Lake Gosiute Lake Unita | | A scouring rush morphospecies. |
| Lygodiaceae | Lygodium | †L. dentoni Lesquereux, 1875 | Rejected | 1? specimen | A climbing fern species. Type specimens missing by 1923 Brown (1934) rejected per Knowlton and dubious locality. |
| Lygodiaceae | Lygodium | †L. kaulfussi Heer, 1861 | Fossil Lake Lake Gosiute Lake Unita | Numerous | A climbing fern species. First described as Lygodium neuropteroides (1870) |
| Marattiaceae | Danaea | †D. coloradensis Knowlton, 1923 | Lake Unita | 1 specimen | A possible marattiaceous fern leaf morphospecies. The genus affiliation was questioned by MacGinitie (1969). |
| Marsileaceae | Marsilea | †M. sprungerorum Hermsen, 2019 | Lake Uinta (Parachute Creek Member) | Numerous | A water clover fern. |
| Osmundaceae | Osmunda? | †Q.? sepulta (Newberry) Knowlton, 1923 | Lake Gosiute | 2 specimens | A possible osmundaceous fern leaf morphospecies. First described as Pecopteris sepulta (1883) |
| Salviniaceae | Azolla | †A. berryi Brown, 1934 | Lake Unita | 1 specimen | A mosquito fern morphospecies. |
| Salviniaceae | Salvinia | †S. preauriculata Berry, 1925 | | | A watermoss morphospecies. |
| Pteridaceae | Acrostichum | †A. hesperium Newberry, 1883 | Lake Gosiute | 3 specimens | A parkerioid leather fern leaf morphospecies. |

### Cycadalean palynomorphs

| Genus | Species | Member | Abundance | Notes | Image |
| †Cycadopites | †C. sp. | Lake Uinta (Parachute Creek Member) | Numerous | Various Cycas - Zamia Cycad palynomorphs. | |
| †Dioonipites | †D. sp. | Lake Uinta (Parachute Creek Member) | 5 specimens | A Dioon like Cycad palynomorph. | |

### Conifers

| Family | Genus | Species | Member | Abundance | Notes |
| Cupressaceae | Sequoia | Cf. †S. affinis Lesquereux, 1876 | Lake Unita | | A coast redwood relative. |
| Pinaceae | Picea | †P. pinifructus Brown, 1929 | Lake Unita | 1 specimen | First identified as a spruce seed. Deemed a jr synonym of Cercidiphyllum arcticum by Brown (1939). |
| Pinaceae | Pinus | †P. balli Brown, 1934 | Lake Unita | 1 specimen | A 3-needle pine morphospecies. |
| Pinaceae | Pinus | †P. florissanti Lesquereux, 1885 | Lake Unita | 1 specimen | A pine morphospecies. |
| incertae sedis | †Taxites | †T. eocenica Brown, 1929 | Lake Uinta | 1 specimen | Isolated conifer needles of uncertain affiliation. Similar to some Cupressaceae, Pinaceae, and Taxaceae genera. |

#### Conifer palynomorphs

| Genus | Species | Member | Abundance | Notes |
| Abies | †A. concolipites Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | 2 specimens | A true fir palynomorph similar to Abies concolor. |
| †Abietipites | †A. antiquus Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | 2 specimens | A generally abietine-like palyonomorph. |
| †Cedripites | †C. eocenicus Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | 1 specimen | A Cedrus libani cedar-like palyonomorph. |
| †Inaperturopollenites | †I. concedipites (Wodehouse) Krutzsch, 1971 | Lake Uinta (Parachute Creek Member) | 6 specimens | A Cunninghamia-like palyonomorph. First described as Cunninghamia concedipites (1933). |
| †Inaperturopollenites | †I. vacuipites (Wodehouse) Krutzsch, 1971 | Lake Uinta (Parachute Creek Member) | 1 specimen | A Chinese swamp cypress-like palyonomorph. First described as Glyptostrobus vacuipites (1933). |
| Picea | †P. grandivescipites Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | 6 specimens | A spruce palyonomorph. |
| Pinus | †P. scopulipites Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | Numerous | A pine palyonomorph. Less common than P. strobipites. |
| Pinus | †P. strobipites Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | Numerous | A pine palyonomorph. |
| Pinus | †P. tuberculipites Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | 6 specimens | A pine palyonomorph. |
| Taxodium | †T. hiatipites Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | Numerous | A bald cypress palyonomorph. |
| †Tsugaepollenites | †T. viridifluminipites (Wodehouse) R. Potonié, 1958 | Lake Uinta (Parachute Creek Member) | 1 specimen | A hemlock-like palyonomorph. First described as Tsuga viridifluminipites (1933) Moved from Zonalapollenites viridifluminipites (1953). |

### Gnetalean palynomorphs

| Genus | Species | Member | Abundance | Notes | Image |
| †Gnetaceae-pollenites | †G. eocenipites (Wodehouse) R. Potonié, 1958 | Lake Uinta (Parachute Creek Member) | 12 specimens | An Ephedra-like palyonomorph. First described as Ephedra eocenipites (1933). | |

### Magnoliids

| Family | Genus | Species | Member | Abundance | Notes |
| Aristolochiaceae | Aristolochia | †A. mortua Cockerell, 1908 | | | An pipevine leaf morphospecies. |
| Hernandiaceae | Illigera | †I. eocenica Manchester & O'Leary, 2010 | Lake Unita | | An Illigera seed morphospecies. |
| Lauraceae | Beilschmiedia | †B. eocenica (R.W. Brown) MacGinitie, 1969 (non-Reid & Chandler, 1933) | | | A Beilschmiedia leaf morphospecies. Name a jr homonym of Beilschmiedia eocenica E. Reid & M. Chandler, 1933 |
| Lauraceae | Lindera | †L. allardi MacGinitie, 1969 | | | A spicebush leaf morphospecies. |
| Lauraceae | Lindera | †L. varifolia MacGinitie, 1969 | Lake Unita | | A spicebush leaf morphospecies. |
| Lauraceae | Ocotea | †O. coloradensis (R.W. Brown) LaMotte, 1952) | Lake Unita | 2 specimens | An Ocotea leaf morphospecies. First described as Oreodaphne coloradensis (1934) |
| Lauraceae | Ocotea | †O. lancifolia (Lesquereux) LaMotte, 1952 | Lake Gosiute Lake Unita | 2 specimens | An Ocotea leaf morphospecies. First described as Sapindus lancifolius (1883) Moved from Oreodaphne lancifolia (1934) Also includes Oreodaphne knowltoni (1929) |
| Lauraceae | Persea | †P. coriacea MacGinitie, 1969 (non-Engelhardt, 1895) | | | A Persea leaf morphospecies. Name a jr homonym of Persea coriacea Engelhardt, 1895 |
| Magnoliaceae | Talauma | †T. multiperforata Kruse, 1954 | Lake Gosiute (Eden Valley) | | An magnolia wood morphospecies. |

#### Magnoliid palynomorphs

| Genus | Species | Member | Abundance | Notes | Image |
| Liriodendron | †L. psilopites Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | 1 specimen | A Liriodendron tulipifera-like tulip tree palyonomorph. | |

### Monocots

| Family | Genus | Species | Member | Abundance | Notes |
| Arecaceae | †Palmacites | †P. florissanti (Lesquereux) Read & Hickey, 1972 | Fossil Lake Lake Uinta | | A palmately veined palm leaf morphospecies. Moved from Sabalites florissanti (1930) First described as Flabellaria florissanti (1885). |
| Arecaceae | †Palmoxylon | †P. colei Tidwell, 1973 | Lake Gosiute (Eden Valley) | | A palm wood morphospecies. |
| Arecaceae | †Palmoxylon | †P. contortum Tidwell, 1973 | Lake Gosiute (Eden Valley) | | A palm wood morphospecies. |
| Arecaceae | †Palmoxylon | †P. edenense Tidwell, 1973 | Lake Gosiute (Eden Valley) | | A palm wood morphospecies. |
| Arecaceae | †Palmoxylon | †P. macginitiei Tidwell et al., 1971 | Lake Gosiute (Eden Valley) | | A palm wood morphospecies. |
| Arecaceae | †Phoenicites | †P. haydenii (Newberry) Read & Hickey, 1972 | Lake Gosiute | 1 specimen | A pinnately veined palm leaf morphospecies. Moved from Geonomites haydenii (1923) First described as Manicaria haydenii (1883). Phoenicites haydenii as Manicaria haydenii |
| Arecaceae | Phoenix | †P. windmillis | Fossil Lake (Fossil Butte member) Lake Gosiute (Laney Member) Lake Unita (Parachute Creek Member) | numerous | A Phoenix flower morphospecies. |
| Arecaceae | †Sabalites | †S. powellii (Newberry) Berry, 1930 | Fossil Lake Lake Uinta | | A palmate veined palm leaf morphospecies. First described as Sabal powellii (1883). |
| Cyperaceae? | †Cyperacites | †C.? filiferus | Lake Unita | A number of specimens | Likely rhizomes of monocots?. Oldest specimen first described as Diatryma? filifera, a Gastornis feather. Description of the species as a bird feather was questioned by Alexander Wetmore (1930) Brown (1934) moves the species to Carpolithus filiferus A second group of fossils is described as a cactus, Eopuntia douglassi (1944) Brown redescribes both as cypreaceous rhizomes, and synonymized both species as Cyperus filiferus (1959) Herman Becker (1963) agrees with the synonymy, but moves the species to the Cyperacites morphogenus as Cyperacites? filiferus. |
| Cyperaceae? | †Cyperacites | †C. haydenii (Lesquereux) Knowlton, 1898 | Lake Gosiute | Several specimens | A sedge-like leaf morphospecies. First described as Cyperites haydenii (1885) |
| Cyperaceae? | Cyperus | †C. chavannesi Heer, 1855 | Rejected | 1 specimen | A sedge leaf morphospecies. Rejected by Knowlton (1923) due to dubious location. |
| Dioscoreaceae | Dioscorea | †D. lindgrenii Herrera & Manchester | Fossil Lake (Fossil Butte Member) | 2 specimens | sweet potato fruits |
| Dioscoreaceae | Dioscorea | †D. shermanii Herrera & Manchester | Fossil Lake (Fossil Butte Member) | 1 specimen | sweet potato fruits |
| Juncaceae | Juncus | Indeterminate | Rejected | ? | Scrappy material tentatively identified as rush leaves. Discredited by Knowlton (1923) due to missing specimens |
| Poaceae | Arundo | †A. reperta Lesquereux, 1876 | Lake Uinta | Several specimens | A giant cane grass morphospecies. The species validity of the fossils was questioned by Knowlton (1923) The species was retained by Brown (1934). |
| Potamogetonaceae | Potamogeton | †P. rubus R.W. Brown, 1934 | Lake Unita | | A pondweed morphotype. |
| Typhaceae | Sparganium | †S. antiquum (Newberry) Berry, 1924 | Lake Gosiute Lake Uinta | | A bur-reed leaf morphospecies. Moved from Brasenia? antiqua (1883) includes Pontederites hesperia (1923) |
| Typhaceae | Sparganium | †S. eocenicum R.W. Brown, 1929 | Lake Gosiute | 1 specimen | A bur-reed leaf morphospecies. |
| Typhaceae | Typha | †T. lesquereuxi Cockerell, 1906 | Lake Unita | | A cattail morphospecies. |
| Zingiberaceae | †Musophyllum | †M. complicatum Lesquereux, 1873 | Lake Gosiute | 5 specimens | A zingiberaceous monocot leaf morphotaxon. |

#### Monocot palynomorphs

| Genus | Species | Member | Abundance | Notes |
| †Arecipites | †A. punctatus Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | 1 specimen | A Phoenix dactylifera-like palm palyonomorph. |
| †Arecipites | †A. rugosus Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | 1 specimen | A palm palyonomorph. |
| †Peltandripites | †P. davisii Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | 1 specimen | A tuckahoe-like arrow-arum palyonomorph. |
| Potamogeton | †P. hollickipites Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | Numerous | A Potamogeton palyonomorph. |
| †Smilacipites | †S. echinatus Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | 2 specimen | A Smilax-like palyonomorph. |
| †Smilacipites | †S. herbaceoides Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | 1 specimen | A Smilax-like palyonomorph. |
| †Smilacipites | †S. molloides Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | 1 specimen | A Smilax mollis-like palyonomorph. |

### Ceratophyllales

| Family | Genus | Species | Member | Abundance | Notes | Image |
| Ceratophyllaceae | Ceratophyllum | †C. muricatum incertum (Brown) Herendeen, Les, & Dilcher, 1990 | Fossil Lake | 19 Specimens | A prickly hornwort subspecies. First described as a full species by Berry (1930). Moved to subspecies by Herendeen, Les, & Dilcher (1990) | |

### Eudicots
#### Basal Eudicots

| Family | Genus | Species | Member | Abundance | Notes |
| Berberidaceae | "Mahonia" | †"M." eocenica (R.W. Brown) C.A. Arnold, 1936 | Lake Uinta | 1 Specimen | An oregon grape leaf morphospecies. First described as Odostemon eocenica (1934) |
| Menispermaceae | †Menispermites | †M. limacioides MacGinitie, 1969 | | | A moon-seed leaf morphospecies. |
| Menispermaceae | Stephania | †S. wilfii Han & Manchester, 2017 | Lake Uinta (Wilkins Peak Member) | Numerous | A moon-seed fruit. |
| Nelumbonaceae | †Nelumbo | Undescribed | Lake Gosiute | | An undescribed Lotus leaf species. |
| Platanaceae | †Macginitiea | †M. wyomingensis (Knowlton & Cockerell) Manchester, 1986 | Lake Untia (Parachute Creek Member) | | A sycamore relative species. First named Aralia macrophylla Newberry, 1882 (non-Lindley, 1844) Renamed to Aralia wyomingensis (1919) Moved from Platanus wyomingensis (1969) |
| Platanaceae | †Platanites | †P. fremontensis (Berry) Nares, Huegele, Manchester | Lake Untia (Parachute Creek Member) | multiple specimens | A sycamore relative species. First described as Negundo fremontensis (1930) Moved from Aleurites fremontensis (1974) |
| Proteaceae | Lomatia | †L.? microphylla Lesquereux, 1876 | Rejected | specimens missing | First identified as a guitarplant leaf morphospecies. Rejected by Brown (1934) due to missing specimens & dubious locality. |
| Trochodendraceae? | †Nordenskioldia | †N. borealis Heer, 1870 | Rejected | | A basal trochodendroid Rejected by Manchester, Crane & Dilcher (1991) considered Carpites cocculoides like. |

#### Superasterids

| Family | Genus | Species | Member | Abundance | Notes |
| Apocynaceae | †Apocynospermum | †A. coloradensis Brown, 1929 | Lake Unita | 1 specimen | An apocynaceous seed morphospecies. |
| Apocynaceae | †Aspidospermoxylon | †A. uniseriatum Kruse, 1954 | Lake Gosiute | | An apocynaceous wood morphospecies. |
| Araliaceae | †Allopanax | †A. quinus (Macginitie) Doweld | Lake Uinta (Parachute Creek Member) | | An Apialean leaf mophogenus. Moved from Araliophyllum quinus (1969). |
| Caryophyllaceae | †Alsinites | †A. revelatus Cockerell, 1925 | Lake Unita | 1 specimen | A caryophyllacous flower morphotaxon. |
| Ericaceae | Andromeda | †A. delicatula Lesquereux, 1885 | | 2 specimens | A possible bog rosemary ericaceous morphospecies. |
| Oleaceae | Osmanthus | †O. praemissa (Lesquereux) Cockerell, 1906 | Lake Uinta | | An Osmanthus leaf morphospecies. Moved from Olea praemissa (1885) |
| Oleaceae | Osmanthus | †O. viridiflumensis (Knowlton) MacGinitie, 1969) | Lake Uinta | 1 specimen | An Osmanthus leaf morphospecies. Moved from Ocotea viridiflumensis (1952) First described as Oreodaphne viridiflumensis (1923) |
| Polemoniaceae | †Gilisenium | †G. hueberi Lot, Manchester, & Dilcher, 1998 | Fossil Lake | 1 specimen | A polemoniaceous herb species. |
| Solanaceae | †Lycianthoides | †L. calycina Deanna et al. | Lake Uinta (Parachute Creek Member) | 3 specimens | A nightshade family fruit |
| Styracaceae | Styrax | †S. transversa MacGinitie, 1969 | Lake Unita | | A snowbell leaf morphotype. |
| Symplocaceae | Symplocos | †S. exilis MacGinitie, 1969 | Lake Unita | | A Symplocaceous leaf morphotype. |
| Incertae sedis | †Othniophyton | †O. elongatum (MacGinitie) Manchester, Judd, Correa-Narvaez, 2024 | Lake Unita | | A superastrid plant of possible caryophyllalean affinity. First described as Oreopanax elongatum (1969) O. elongatum synonymy Apocynophyllurn wilcoxense (of Berry, 1929) ?Celastrophyllum lesquereuxii (1929) Ternstroemites viridifluminis (1929) |

#### Superrosids

| Family | Genus | Species | Member | Abundance | Notes |
| Altingiaceae | Liquidambar | †L. callarche Cockerell, 1925 | Lake Unita | 2 specimens | A sweetgum species. |
| Anacardiaceae | †Barkleya | †B. schinoloxa (R. W. Brown) Manchester & Judd | Lake Gosiute (Laney Member) Lake Uinta (Parachute Creek Member) | Numerous | An anacardiaceous samara. Moved from Anacardites schinoloxus (1929). Includes Anacardites schinus R. W. Brown, 1934 Possibly the fruits of "Rhus" nigricans. |
| Anacardiaceae | †Edenoxylon | †E. parviareolatum Kruse, 1954 | Lake Gosiute (Eden Valley) | | An anacardiaceous wood morphospecies. |
| Anacardiaceae | Rhus | †R. longepetiolata (Lesquereux) R.W. Brown, 1934 | Lake Gosiute | | An anacardiaceous leaf morphotype. Moved from Ailanthus longepetiolatus (1934) |
| Anacardiaceae | Rhus | †"R." nigricans (Lesquereux) Knowlton, 1923 | Lake Gosiute (Laney Member) Lake Uinta (Parachute Creek Member) | Numerous | An anacardiaceous leaf morphotype. Moved from Myrica nigricans (1929). Possibly the leaves of Barkleya schinoloxa. "R." nigricans synonymy Comptonia insignis Lesquereux of Brown, 1934 Cupanites nigricans (Lesquereux) Berry, 1924 Koelreuteria nigricans (Lesquereux) Brown, 1946 Koelreuteria viridifluminis (Hollick) Brown, 1934 Myrica alkalina Lesquereux, 1883 Myrica ludwigii Schimper of Lesquereux, 1872 Myrica undulata? Schimper of Lesquereux,1878 (pro part) Myrica zachariensis Saporta of Lesquereux, 1883 (pro part) Planera variabilis Newberry, 1883 (pro part) Rhus myricoides Knowlton, 1923 Rhus variabilis (Newberry) Knowlton, 1923 Staphylea viridiftuminis Hollick, 1929 |
| Anacardiaceae | Schmaltzia | †S. vexans Cockerell, 1906 | Lake Gosiute | | A sumac leaf morphospecies. Moved from Rhus vexans (1885) Considered nomen dubium by MacGinitie (1969) |
| Anacardiaceae | †Schinoxylon | †S. actinoporosum Kruse, 1954 | Lake Gosiute (Eden Valley) | | An anacardiaceous wood morphospecies. |
| Anacardiaceae | Toxicodendron | †T. winchesteri (Knowlton) MacGinitie, 1969 | Lake Gosiute | | A poison oak leaf morphospecies. First described as Sapindus winchesteri (1923) |
| Burseraceae | Bursera | †B. inaequilateralis (Lesquereux) MacGinitie, 1969 Bursera inaequilateralis as Alnites inaequilateralis USNM P167 | | | A bursera leaf morphotype. First named as Alnites inaequilateralis (1876) B. inaequilateralis synonymy Alnites inaequilateralis Lesquereux, 1878 Alnus inaequilateralis (Lesquereux) Lesquereux, 1883 Comptonia? anomala Knowlton, 1923 Planera inaequilateralis (Lesquereux) Knowlton, 1923 Planera variabilis Newberry, 1883 |
| Cannabaceae | Celtis | †C. mccoshii Lesquereux, 1883 | Lake Gosiute Lake Unita | 2 specimens | A hackberry leaf morphospecies. Includes Celtis debequensis (1928) |
| Capparaceae | †Forchhammerioxylon | †F. scleroticum Kruse, 1954 | Lake Gosiute (Eden Valley) | | A capparaceous wood morphospecies. |
| Celastraceae | Celastrus | †C. winchesteri (Knowlton) MacGinitie, 1969 | Lake Unita | 1 specimen | A staff vine leaf morphospecies. Moved from Juglans winchesteri (1923) Includes Juglans alkalina (1875 [1876] ) |
| Celastraceae | †Celastrophyllum | †C. emarginatum | Lake Unita | | A staff vine relative leaf morphospecies. MacGinitie (1969) considered the species nomen dubium. |
| Crassulaceae | Sedum? | †S.? hesperium Knowlton, 1923 | Lake Uinta | 1 specimen | A possible stonecrop leaf morphospecies. Considered nomen dubium by MacGinitie (1969) |
| Euphorbiaceae | †Heveoxylon | †H. microporosum Kruse, 1954 | Lake Gosiute (Eden Valley) | | An euphorb wood morphospecies. |
| Fabaceae | Amorpha | †A. utensis Cockerell, 1925 | Lake Unita | 1 specimen | A legume leaf morphospecies. |
| Fabaceae | Arcoa | †A. lindgreni Herendeen & Herrera, 2019 | Fossil Lake | 3 specimens | A caesalpinioid legume. |
| Fabaceae | Caesalpinia | †C. flumen-viridensis Herendeen & Dilcher, 1991 | Lake Gosiute | 2 specimens | A Caesalpinia subg. Mezoneuron seed morphospecies. |
| Fabaceae | Caesalpinia | †"C." pecorae R.W. Brown, 1956 | Lake Unita | 2 specimens | First named as a Caesalpinia leaf morphospecies. Considered a Detarieae tribe species by Herendeen & Dilcher (1991). |
| Fabaceae | †Caesalpinites | †C. falcatus MacGinitie, 1969 | | | A Caesalpinia-like leaf morphospecies. |
| Fabaceae | Cercis | †C. tenuinervis (Lesquereux) R.W. Brown, 1934 | Lake Gosiute | 1 specimen | A redbud leaf morphospecies. Considered nomen dubium by MacGinitie (1969). |
| Fabaceae | Erythrina | †E. roanensis MacGinitie, 1969 | Lake Unita | | A coral tree leaf morphospecies. |
| Fabaceae | Gymnocladus | †G. hesperia (R.W. Brown) MacGinitie, 1969 | Lake Uinta | | A coffeetree leaf morphospecies. Moved from Cassia hesperia (1929) Includes Chrysobalanus lacustris (1929) & Banisteria bradleyi (1929) |
| Fabaceae | †Leguminosites | †L. alternans Lesquereux, 1875 [1876] | Rejected | | A legume leaf morphospecies. Rejected due to missing specimens by Knowlton (1923) and Brown (1934) |
| Fabaceae | †Leguminosites | †L. lesquereuxiana Knowlton, 1898 | Lake Unita | | A legume leaf morphospecies. L. lesquereuxiana synonymy Bumelia coloradensis Cockerell, 1925 Dalbergia knowltoni Cockerell, 1925 Dalbergia retusa Knowlton, 1923 [non-Hemsl. 1878] Leguminosites cassioides Lesquereux, 1878 [non-Engelhardt, 1870] Sophora coloradensis Knowlton, 1923 |
| Fabaceae | †Leguminosites | †L. regularis MacGinitie, 1969 | Lake Unita | | A legume leaf morphospecies. |
| Fabaceae | ↑Parvileguminophyllum | †P. coloradensis (Knowlton) Call & Dilcher, 1994 | Lake Uinta | | A legume leaf morphospecies. Moved from Mimosites coloradensis (1923). P. coloradensis synonymy Podogonium americanum Lesquereux, 1878 (of Brown 1929) Mimosites debequensis R.W. Brown, 1929 Mimosites falcatus R.W. Brown, 1929 |
| Fabaceae | Swartzia | †S. wardelli MacGinitie, 1969 | Lake Uinta | | A swartzieous leaf morphotype. |
| Fagaceae | Quercus | †Q. castaneopsis Lesquereux, 1883 | Lake Gosiute Lake Uinta | Several fragmentary specimens | An oak morphospecies. P. cinnamomoides synonymy Quercus castanoides Newberry, 1883 Ilex maculata Lesquereux, 1883 Ilex? affinis Lesquereux, 1872 Considered nomen dubium by MacGinitie (1969). |
| Fagaceae | Quercus | †"Q. cuneatus" MacGinitie, 1969 (non-Wangenh. 1787 | Lake Unita | | An oak leaf morphospecies. Name a jr homonym of Quercus cuneata Wangenheim, 1787 |
| Fagaceae | Quercus | †Q. drymeja Unger, 1847 | Rejected | | An oak morphospecies. First described from Europe, Rejected from flora by MacGinitie (1969). |
| Fagaceae | Quercus | †Q. petros MacGinitie, 1969 | Lake Unita | | An oak leaf morphospecies. |
| Fagaceae | Quercus | †Q. utensis Cockerell, 1927 | Lake Unita | | An oak morphospecies. Considered nomen dubium by MacGinitie (1969). |
| Hamamelidaceae | Distylium | †D. eocenica (R.W. Brown) MacGinitie, 1969 | Lake Unita | 1 specimen | A winter-hazel leaf morphotype. Moved from Betula coloradea (1934) First named Betula eocenica (1928 non Ettingshausen (1858) Also includes Grewiopsis cissifolius (1929) |
| Juglandaceae | Juglans | †J. crossii Knowlton, 1898 | Lake Gosiute | 1 specimen? | A walnut leaf morphospecies. |
| Juglandaceae | Juglans | †J. bilinica Unger, 1850 | | 1 specimen | A walnut leaf morphospecies. Moved from Hicoria juglandiformis (1898) |
| Juglandaceae | Juglans | †J. schimperi Lesquereux, 1873 | Lake Unita | | A walnut leaf morphospecies. Includes Juglans occidentalis (1883) & Ficus ungeri (1872) |
| Juglandaceae | †Palaeocarya | Cf. †P. clarnensis Manchester, 1987 | Lake Gosiute? | | A Palaeocarya nut morphospecies similar to Palaeocarya clarnensis. |
| Juglandaceae | †Palaeocarya | †P. uintaensis (MacGinitie) Manchester, 1987 | Lake Unita | | A Palaeocarya nut morphospecies. |
| Juglandaceae | Platycarya | †P. castaneopsis (Lesquereux) Wing & Hickey, 1984 | Fossil Lake Lake Uinta | | A Platycarya species. Moved from Quercus castaneopsis (1883) |
| Juglandaceae | Pterocarya | †P. macginitii Manchester & Dilcher, 1982 | Lake Gosiute | | A wingnut seed morphospecies. |
| Juglandaceae | Pterocarya | †P. roanensis MacGinitie, 1969 | Lake Unita | | A wingnut leaf morphospecies. |
| Malvaceae | Hibiscus | †H. roanensis R.W. Brown, 1934 | Lake Unita | | An Hibiscus leaf morphospecies. |
| Malvaceae | Ochroma | †O. murata R.W. Brown, 1934 | Lake Unita | 1 specimen | A balsa tree leaf morphospecies. |
| Malvaceae | Sterculia | †S. coloradensis R.W. Brown, 1929 | Lake Unita | 1 specimen | A sterculioid leaf morphospecies. |
| Malvaceae | Triumfetta | T. ovata MacGinitie, 1969 (non-De Candolle, 1824) | | | A burbark leaf morphospecies. Jr homonym of Triumfetta ovata De Candolle, 1824 |
| Meliaceae | Cedrela | †C. trainii C.A. Arnold, 1936 | Lake Unita | | A meliaceous leaf morphospecies. |
| Moraceae | †Welkoetoxylon | †W. multiseriatum Boonchai, Manchester & Wheeler | Lake Gosiute (Tipton Shale Member) | 1 specimen | A moraceous wood morphogenus. |
| Myricaceae | Morella scalariformis | †M. scalariformis (Kruse), Wheeler & Manchester, 2021 | Lake Gosiute (Eden Valley) | | A myricaceous wood morphospecies. First named as Myrica scalariformis (1954) Moved from Myricoxylon scalariforme (1962) |
| Myricaceae | Myrica | †M. salicina Unger, 1850 | Rejected | sp missing | Identified as a European Myrica species Rejected by Knowlton (1923) due to the specimens being missing. |
| Myrtaceae | †Syzygioides | †S. americana (Lesquereux) Manchester, Dilcher, & Wing, 1998 | Lake Unita | Circa 26 specimens | A myrtaceous species. First described as Eucalyptus americana (1872) Includes Ficus omballi (1929) & Eugenia americana (1969) |
| Rhamnaceae | †Berchemiopsis | †B. paucidentata MacGinitie, 1969 | Lake Unita | | A rhamnaceous leaf morphotype. |
| Rhamnaceae | Ptelea | †P. cassioides (Lesquereux) MacGinitie, 1969 | Rejected | | Type specimen leaf from the Florissant Formation Green River Fruits rejected by Call & Dilcher as not Ptelea. |
| Rhamnaceae | Ptelea | †P. paliuruoides (R.W. Brown) Manchester & O'Leary, 2010 | Lake Unita | | A rhamnaceous seed morphospecies. First describe as Carpolithus paliuroides (1934) |
| Rhamnaceae | †Rainbowia | †R. rhamnoides Manchester & O'Leary, 2010 | Lake Unita | | A rhamnaceous seed morphospecies. |
| Rosaceae | Prunus | †P. stewarti MacGinitie, 1969 | Lake Gosiute | | A cherry leaf morphospecies. First named Amygdalus gracilis (1883) Moved from jr homonym Prunus gracilis (non Engelm. & Gray, 1845) |
| Rosaceae | Rosa | †R. hillae Lesquereux, 1885 | | | A rose leaf morphospecies. |
| Rutaceae | †Amyridoxylon | †A. ordinatum Kruse, 1954 | Lake Gosiute (Eden Valley) | | A citrus relative wood morphospecies. |
| Rutaceae | Fagara | †F. biseriata Kruse, 1954 | Lake Gosiute (Eden Valley) | | A citrus relative wood morphospecies. |
| Rutaceae | Fagara | †F. monophylloides Kruse, 1954 | Lake Gosiute (Eden Valley) | | A citrus relative wood morphospecies. |
| Salicaceae | Populus | †P. cinnamomoides (Lesquereux) MacGinitie, 1969 | Lake Uinta | Numerous | An Aspen/cottonwood relative. First described as Ceanothus cinnamomoides (1872) P. cinnamomoides synonymy Carpites newberryana Knowlton, 1926 Cinnamomum scheuchzeri Heer of Lesquereux, 1883 Ficus wyomingiana Lesquereux, 1878 Ilex wyomingensis Lesquereux, 1878 Ilex vyomingensis Lesquereux, 1878 Luehea newberryana (Knowlton) MacGinitie, 1974 Zizyphus cinnamomoides (Lesquereux) Lesquereux, 1878 Zizyphus longifolia Newberry, 1883 |
| Salicaceae | Populus | †P. wilmattae Cockerell, 1925 | Lake Uinta | Numerous | An Aspen/cottonwood relative. |
| Salicaceae | Populus | †P. tidwellii Manchester, Judd, & Handley, 2006 | Lake Uinta | Numerous | An Aspen/cottonwood relative. |
| Salicaceae | †Pseudosalix | †P. handleyi Boucher, Manchester, & Judd, 2003 | Lake Uinta (Parachute Creek Member) | | A salicaceous species. Includes Potentilla? byrami (1925), Antholithes polemonioides (1929) & Antholithes sp.6 (1934) |
| Salicaceae | Salix | †S. cockerelli R.W. Brown, 1934 | Lake Unita | 4 Specimens | A willow leaf morphospecies. |
| Salicaceae | Salix | †S. longiacuminata Knowlton ex R.W. Brown, 1934 | Lake Gosiute | 1 specimen | A willow leaf morphospecies. Includes Banksia cockerelli (1929) |
| Sapindaceae | Allophylus | †A. flexifolia (Lesquereux) MacGinitie, 1969 | Lake Gosiute Lake Uinta | 4 Specimens | An Allophylus leaf morphospecies. First named Euonymus flexifolia (1885) A. flexifolia synonymy Fraxinus flexifolia (Lesquereux) Brown, 1934 Fraxinus petiolata Brown, 1929 Odostemon reynoldsii Hollick, 1929 |
| Sapindaceae | Athyana | †A. balli (R.W. Brown) MacGinitie, 1969 | Lake Unita | | A sapindaceous leaf morphotype. Moved from Rhus balli (1934). |
| Sapindaceae | "Cardiospermum" | †"C." coloradensis (Knowlton) MacGinitie, 1969 | Lake Uninta | Numerous | A possible ballon vine leaf morphospecies. Moved from Lomatia coloradensis (1929) "C." coloradensis synonymy Lomatia obtusiuscula Cockerell, 1925 Melia coloradensis (Knowlton) Cockerell, 1925 Phyllites coloradensis Knowlton, 1923 Pimelea spatulata Knowlton, 1923 |
| Sapindaceae | Koelreuteria | †K. allenii (Lesquereux) W.N. Edwards, 1929 | Fossil Lake (Fossil Butte Member) Lake Unita (Parachute Creek Member) | | A golden rain tree fruit morphospecies. Includes Koelreuteria uiridifluminis seeds |
| Sapindaceae | Sapindus | †S. dentoni Lesquereux, 1876 | Lake Unita | | A soapberry leaf morphotype. Includes Salix media (1872) & Myrica torryi (1929) |
| Sapindaceae | Sapindus | †S. obtusifolius Lesquereux, 1874 | Lake Unita | | A soapberry leaf morphotype. Includes Salix media (1872) & Myrica torryi (1929) |
| Sapindaceae | Thouinia | †T. eocenica R.W. Brown, 1929 | Lake Unita | | A soap berry leaf morphospecies. |
| Simaroubaceae | Ailanthus | †A. lesquereuxii Cockerell, 1927 | | | A tree of heaven fruit morphospecies |
| Surianaceae | Suriana | †S. inordinata Kruse, 1954 | Lake Gosiute (Eden Valley) | | A surianaceous wood morphospecies. |
| Tetramelaceae | †Parvaspicula | †P. lepidioides (Cockerell) Deanna et al. | Lake Uinta (Parachute Creek Member) | Numerous | A tetramelaceous fruit morphotype. The type species is Clethra (?) lepidioides Cockerell (1925) Also includes Antholithes pendula (1929) |
| Tetramelaceae | †Punctaphyllum | †P. glandulosa (Brown) Manchester, Judd, & Kodrul, 2023 | Lake Uinta (Parachute Creek Member) | Numerous | A tetramelaceous leaf morphotype. The type species is Cucurbita glandulosa (1929) Includes Aleurites glandulosa (1969) & Dendropanax latens (1974) Also includes the Ficus mississippiensis of Brown (1928) |
| Ulmaceae | †Cedrelospermum | †C. nervosum (Newberry) Manchester, 1989 | Lake Uinta | Numerous | An ulmaceous species. First named as Planera nervosa (1883) C. nervosum synonymy Banksites lineatulus Cockerell, 1925 Dalbergia viridiflumensis Knowlton, 1923 Lomatia lineatulus (Cockerell) MacGinitie, 1969 Myrica minuta Knowlton, 1923 Myrica praedrymeja Knowlton, 1923 Rhus myricoides (Knowlton) Brown, 1929 Salix lineara Knowlton, 1923 Zelkova nervosa (Newberry) Brown, 1929 |
| Vitaceae | Cissus | †C. parrottiaefolia Lesquereux, 1876 | Rejected | 3 specimens | A grape relative leaf morphospecies. Rejected from formation by Knowlton (1923) due to distinctly different matrix. |

### Eudicot palynomorphs

| Genus | Species | Member | Abundance | Notes |
| †Ailanthipites | †A. berryi Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | | An Ailanthus glandulosa-like soapberry family palynomorph. |
| †Alni-pollenites | †A. speciipites (Wodehouse) Raatz, 1938 | Lake Uinta (Parachute Creek Member) | Numerous | An alder-like palynomorph. first described as Alnus speciipites (1933) |
| Betula | †B. claripites Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | 3 specimens | A Betula lenta-like birch palynomorph. |
| †Caprifoliipites | †C. viridi-fluminis Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | 1 specimen | A caprifoliaceous-like palynomorph. |
| Carpinus | †C. ancipites Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | | A Carpinus-like palynomorph. |
| Carya | †C. juxtaporipites (Wodehouse) LaMotte, 1952 | Lake Uinta (Parachute Creek Member) | 1 specimen | A hickory-like palynomorph. First described as Hicoria juxtaporipites (1933) |
| Carya | †C. viridi-fluminipitis (Wodehouse) Wilson & Webster, 1944 | Lake Uinta (Parachute Creek Member) | 1 specimen | A Carya myristiciformis-like hickory palynomorph. First described as Hicoria viridi-fluminipites (1933) |
| Ericipites | †E. brevisulcatus Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | 1 specimen | A Calluna vulgaris-like heath family palynomorph. |
| Ericipites | †E. longisulcatus Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | 2 specimens | A heath family-like palynomorph. |
| †Juglanspollenites | †J. nigripites (Wodehouse) Wingate & Nichols, 2001 | Lake Uinta (Parachute Creek Member) | 1 specimen | A walnut-like palynomorph. First described as Juglans nigripites (1933) |
| †Momipites | †M. corylipites (Wodehouse) D.J. Nichols, 1973 | Lake Uinta (Parachute Creek Member) | 2 specimens | An Engelhardia-like palynomorph. First described as Engelhardia corylipites (1933). |
| †Momipites | †M. coryloides Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | Numerous | A Celtis iguanaea-like hackberry palynomorph. |
| †Myricipites | †M. dubius Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | 1 specimen | A bayberry-like palynomorph. |
| Myriophyllum | †M. ambiguipites Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | 1 specimen | A Myriophyllum spicatum-like watermillfoil family palynomorph. |
| †Rhoipites | †R. bradleyi Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | 4 specimens | A Rhus typhina-like cashew family palynomorph. |
| Salix | †S. discoloripites Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | Numerous | A Salix discolor and S. fragilis-like willow palynomorph. |
| †Talisiipites | †T. fischeri Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | Numerous | A Talisia depressa-like soapberry family palynomorph. |
| Tilia | †T. crassipites Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | 1 specimen | A Tilia americana-like linden palynomorph. |
| Tilia | †T. tetraforaminipites Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | 3 specimens | A Tilia americana-like linden palynomorph. |
| Tilia | †T. vescipites Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | 1 specimens | A Tilia americana-like linden palynomorph. |
| †Vitipites | †V. dubius Wodehouse, 1933 | Lake Uinta (Parachute Creek Member) | 1 specimen | A Vitis vinifera-like grape family palynomorph. |

### Angiosperms of uncertain affiliation

| Genus | Species | Member | Abundance | Notes |
| †Achaenites | †A. cichorioides Knowlton, 1923 | Lake Uinta | 1 specimen | A achene like structure of unidentified affiliation. |
| †Antholithes | †A. dubia R.W. Brown, 1929 | Lake Unita | 1 specimen | An 8-lobed/petaled flower of unidentified affiliation. |
| †Antholithes | †A. improbus Lesquereux, 1883 | | 2 specimens | A flowering structure of unidentified affiliation. |
| †Antholithes | †A. vitaciflora R.W. Brown, 1929 | Lake Unita | 1 specimen | A cluster of possible vitaceous flowers-fruits. |
| †Antholithes | †A. winchesteri (Knowlton) MacGinitie, 1969 | Lake Unita | 1 specimen | A flowering structure of unidentified affiliation. First described as Sambucus? winchesteri (1923) |
| †Antholithes | †A. sp 1 R.W. Brown, 1934 | Fossil Lake | 1 specimen | A possibly cruciferous or orrograceous flower of unidentified affiliation. |
| †Antholithes | †A. sp 2 R.W. Brown, 1934 | Lake Unita | 1 specimen | A flower with many stamens of unidentified affiliation. |
| †Antholithes | †A. sp 3 R.W. Brown, 1934 | Lake Unita | 1 specimen | A malvaceous looking flower of unidentified affiliation. |
| †Antholithes | †A. sp 4 R.W. Brown, 1934 | Lake Unita | 1 specimen | A flower with a superior ovary surrounded by the five-toothed calyx. |
| †Antholithes | †A. sp 5 R.W. Brown, 1934 | Lake Unita | 1 specimen | A flower with tubular receptacle surmounted by a four-parted calyx. |
| †Antholithes | †A. sp 7 R.W. Brown, 1934 | Fossil Lake | 1 specimen | A large flower or a badly distorted leaf of a Nelumbo? |
| †Bonanzacarpum | †B. sprungerorum Manchester & Lott, 2019 | Lake Uinta (Parachute Creek Member) | Numerous | A eudicot fruit of uncertain phylogenetic placement. |
| †Carpites | †C. inquirenda Knowlton, 1923 | Lake Unita | 1 specimen | A nutlet or fruit of unidentified affiliation. |
| †Carpites | †C. newberryanus Knowlton, 1923 | | 3 specimens | A nutlet of unidentified affiliation. First described as Juglans occidentalis nuts (1898). First spelled Carpites newberryana |
| †Carpites | †C. viburni Lesquereux, 1878 | | 1 specimen | A seed or nutlet of unidentified affiliation. Includes Carpolithes capsularis (1929) |
| †Carpolithus | †C. alabaccus R.W. Brown, 1934 | Lake Unita | 1 specimen | A winged or membranous fruit of unidentified affiliation. |
| †Carpolithus | †C. caryophylloides Knowlton, 1923 | Lake Unita | | A dry capsular fruit of unidentified affiliation. |
| †Carpolithus | †C. cassioides R.W. Brown, 1929 | Lake Unita | 2 specimens? | A legume like pod of unidentified affiliation. |
| †Carpolithus | †C. insectoides R.W. Brown, 1934 | Lake Unita | 1 specimen | A winged fruit of unidentified affiliation. |
| †Carpolithus | †C. palrnites R.W. Brown, 1929 | Lake Unita | 1 specimen | A palm fruit or husk like fossil of unidentified affiliation. |
| †Carpolithus | †C. prunoides R.W. Brown, 1934 | Lake Unita | 1 specimen | A flattened fruit of unidentified affiliation. First named Carpolithus ellipticus Brown, 1929 (non-Sternberg, 1825) |
| †Carpolithus | †C. serratifolius R.W. Brown, 1929 | Lake Unita | 1 specimen | Branchlet with leaves and fruits of possible salicaceous affinity. |
| †Carpolithus | †C. vitaceus R.W. Brown, 1934 | Lake Unita | 1 specimen | A possibly vitaceous seed of unidentified affiliation. |
| †Caulinites | †C. acanthus R.W. Brown, 1929 | Lake Unita | 1 specimen | A thorny stem of unidentified affiliation. |
| †Caulinites | †C. prehensus R.W. Brown, 1929 | Lake Unita | 1 specimen | A climbing plant tendril of unidentified affiliation. |
| †Chaneya | †C. tenuis (Lesquereux) Wang & Manchester, 2000 | Lake Gosiute Lake Unita | | A sapindalean flower of uncertain affiliations. Includes Astronium truncatum (1953). |
| †Dicotylophyllum | †D. lesquereuxii (Knowlton) J.A. Wolfe & Tanai, 1987 | | 1 specimen | A leaf of uncertain affiliation. First described as Acer indivisum Lesquereux, 1885 (non-Weber, 1852) Moved from Acer lesquereuxii Knowlton, 1898 |
| †Palibinia | †P. comptonifolia (Brown) Manchester, Judd, & Kodrul, 2023 | Lake Uinta (Parachute Creek Member) | | A pentapetalean eudicot of uncertain affiliation. Moved from Vauquelinia comptonifolia (1969) Originally named Banksia comptonifolia (1934) |
| †Phyllites | †P. ericoides R.W. Brown, 1934 | Lake Unita | 1 specimen | A thick leaf of unidentified affiliation. |
| †Phyllites | †P. fremonti Unger, 1850 | Rejected | 1 specimen | A leaf of unidentified affiliation. R.W. Brown (1934) rejected due to doubtful locality and lost specimen. |
| †Phyllites | †P. glandiferus R.W. Brown, 1934 | Lake Unita | 1 specimen | An odd-pinnately compound leaf of possible fabaceous affinity. |
| †Phyllites | †P. juncoides R.W. Brown, 1929 | Lake Unita | 1 specimen | A leaf of unidentified affiliation. |
| †Phyllites | †P. ouratea R.W. Brown, 1934 | Lake Unita | 1 specimen | A possibly herbaceous leaf of unidentified affinity. |
| †Phyllites | †P. winchesteri Knowlton, 1923 | Lake Unita | 1 specimen | A leaf of unidentified affiliation. |

### Plants of uncertain affiliation

| Genus | Species | Member | Abundance | Notes | Image |
| †Rhizocaulon | †R. dichotomum R.W. Brown, 1929 | Lake Unita | 1 specimen | A root of unidentified affiliation. Has a distinct branched fork. | |
| †Rhizocaulon | †R. natans R.W. Brown, 1929 | Lake Unita | 1 specimen | A rootlet of unidentified affiliation. small with Trapa natans-like rhizoids. | |