# McCoy Brook Formation

The McCoy Brook Formation is a geological formation dating to roughly between 200 and 190 million years ago and covering the Hettangian to Sinemurian stages. The McCoy Brook Formation is found in outcrops around the Bay of Fundy, Nova Scotia.

## Agen

The McCoy Brook Formation rests on the North Mountain Basalt, one of the volcanic flows associated with the Triassic–Jurassic boundary in the Newark Supergroup. The base of the McCoy Brook Formation is probably within 100,000 to 200,000 years of the boundary.

## Scots Bay Member

This thin unit (9 m) of lacustrine sediments is preserved in six small synclinal outcrops around Scots Bay on the west side of the Blomidon Peninsula. Originally named as the Scots Bay Formation, it is now correlated with the lowermost part of the McCoy Brook Formation, where it is referred to as the Scots Bay Member. The Scots Bay Member accumulated in an aerobic lake on the floor of the subtropical Fundy Rift Valley, associated with Silica-rich Hydrothermal Springs derived from the CAMP vulcanism, where the biota is composed of algal Stromatolites, Oncolites, Charophyta, Ostracoda, Gastropoda, Conchostraca, fish bones, calcispheres and logs.

## Fossil content
### Sharks

| Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon | Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited. |
Sharks :
| Name | Species | Location | Stratigraphic position | Material | Notes |
| cf.Hybodus | Indeterminate | Wasson Bluff | Scots Bay member | Teeth & Coprolites | A hybodont shark. Recovered from lacustrine facies | Two Hybodus |

### Ray-finned fish

Ray-finned fish :
| Name | Species | Location | Stratigraphic position | Material | Notes | Images |
| ?Redfieldiid | None designated | Wasson Bluff | Scots Bay member | Scales and skull bones | Found in lacustrine limestone and lacustrine basalt aggregate | |
| aff. Semionotus sp. | None designated | Wasson Bluff | Scots Bay member | Disarticulated remains | Found in lacustrine limestone, lacustrine basalt aggregate, and lacustrine mudstone | Semionotus |

### Synapsids

Synapsids :
| Name | Species | Location | Stratigraphic position | Material | Notes | Images |
| Cynodontia | Indeterminate | Wasson Bluff | Scots Bay Member | Partial right unla Proximal portion of a right ischium | A cynodont |
| Oligokyphus | Oligokyphus sp. | Wasson Bluff | Scots Bay Member | Fragment of a right Dentary. | A tritheledontid cynodont, found in the layers of the Scots Bay member. | Oligokyphus |
| Pachygenelus | cf. P. monus | Wasson Bluff | Upper Member | Excellently preserved fragments of two premaxillae, ten maxillae, and six dentaries | A tritheledontid cynodont | Pachygenelus |
| Tritylodontidae | Indeterminate | Wasson Bluff | Scots Bay Member | Right humerus | A tritylodontid cynodont, found in the layers of the Scots Bay member. | |

### Sphenodonts

Sphenodonts :
| Name | Species | Location | Stratigraphic position | Material | Notes | Images |
| Clevosaurus | C. bairdi | Wasson Bluff | Lower McCoy Brook Formation | Partial skulls and jaws, isolated cranial bones, partial postcranium, postcranial bones | A sphenodontian of relatively small size, found in fluvio-lacustrine sandstone and mudstone, and basalt agglomerate | Clevosaurus |
| cf. Palycymalia | Indeterminate | Wasson Bluff | Middle McCoy Brook Formation | Isolated Remains | A sphenodontian | |
| cf. Sigmala | Indeterminate | Wasson Bluff | Middle McCoy Brook Formation | Isolated Remains | A sphenodontian | |

### Crocodyliforms

Protosuchidae :
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Protosuchus | P. micmac | Wasson Bluff | Lower McCoy Brook Formation | Partial lower jaw, several other skull bones | Found in fluvio-lacustrine sandstone and mudstone, and basalt agglomerate | Protosuchus |
| Sphenosuchid | Indeterminate | Blue sack west Wasson Bluff | Lower McCoy Brook Formation | A maxilla Isolated Osteoderms | Found in fluvio-lacustrine sandstone and mudstone, and basalt agglomerate | |

### Dinosaurs
#### Ornithischia

Ornithischians :
| Genus | Species | Location | Stratigraphic position | Material | Notes |
| Ornithischia | Indeterminate | Wasson Bluff | Scots Bay Member | Impressions of teeth (YPM VP 008668, VP 008691) Vertebral centra (YPM VP 008693) Possible rib fragments (YPM VP008694, VP 008695) | Suggested to be similar to Scutellosaurus and to Leshotosaurus. Represent among the oldest reliable Ornithischian remains of North America. |

#### Theropoda

Ornithischians :
| Genus | Species | Location | Stratigraphic position | Material | Notes |
| Theropoda | Indeterminate | Wasson Bluff | Scots Bay Member | Teeth | Theropod dinosaur teeth similar to Megapnosaurus. |

#### Sauropodomorpha

Sauropodomorph dinosaurs :
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Fendusaurus | F. eldoni | Wasson Bluff | Middle McCoy Brook Formation | YPM VPPU 022196, several vertebrae and limb-bone fragments FGM994GF69, postcranial skeleton FGM998GF9, partial skeleton FGM998GF13_I, large, articulated specimen FGM998GF13/FGM998GF13_III postcranea and dissociated skull NSM005GF009/FGM998GF46, partial, badly deformed and fragmentary skeleton with gastroliths | Although long assigned to Ammosaurus, the material actually represents a new genus and species; represents the most abundant dinosaur in the formation, and has yield specimens with preserved stomach contents that suggest migration patterns. The possibility that represents more than one genus is open. | |

### Ichnotaxa

| Color key Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon | Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited. |
Ichnotaxa :
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Anchisauripus | A. sillimani A. ispp. | Blue sack west McKay Head Wasson Bluff | Middle McCoy Brook Formation | Footprints | Small Theropod Footprints | |
| Anomoepus | A. scambus A. ispp. | Blue sack west McKay Head Old Wife Point tracksite | Middle McCoy Brook Formation | Footprints | Ornithischian Footprints | |
| Batrachopus | B. deweyii B. dispar B. ispp. | McKay Head Old Wife Point tracksite Wasson Bluff tracksite | Middle McCoy Brook Formation | Footprints | Crocodrylomorph Footprints | |
| Eubrontes | E. giganteus E. sillimani E. minusculus E ispp. | Five Islands Provincial Park Old Wife Point tracksite Wasson Bluff tracksite | Middle McCoy Brook Formation | Footprints | Medium-sized Theropod Footprints | |
| Grallator | G. cursorius G. tenuis G. ispp. | McKay Head Old Wife Point tracksite | Middle McCoy Brook Formation | Footprints | Small Theropod Footprints | Grallator |
| Otozoum | O. moodi O. ispp. | Blue sack east McKay Head Minas Basin tracksite | Middle McCoy Brook Formation | Footprints | Sauropodomorph Footprints | Otozoum |