# Cambridge Greensand

The Cambridge Greensand is a geological unit in England whose strata are earliest Cenomanian in age. It lies above the erosive contact between the Gault Formation and the Chalk Group in the vicinity of Cambridgeshire, and technically forms the lowest member bed of the West Melbury Marly Chalk Formation. It is a remanié deposit, containing reworked fossils of late Albian age, including those of dinosaurs and pterosaurs.

## Description

The lithology is made out of glauconitic marl, described as a "chalk mud", containing abundant ostracod, coccolith and foram remains, with a concentration of phosphatic nodules and bones at the base.

## Vertebrate paleofauna
### Birds

Birds :
| Genus | Species | Material | Notes |
| Enaliornis | E. barrette | Braincases, vertebrae, pelvis [and] limb elements | This genus is the oldest known hesperornithine |
| Enaliornis | E sedgwicki | Hindlimb elements | This genus is the oldest known hesperornithine |
| Enaliornis | E. seeleyi | Assorted cranial and postcranial elements | This genus is the oldest known hesperornithine |

### Dinosaurs
#### Ornithischians

| 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. |
Ornithischians :
| Genus | Species | Material | Notes |
| Anoplosaurus | A. curtonotus | "Partial postcranium" | |
| Anoplosaurus | A. major | "Cervical vertebrae." "Vertebrae." | |
| Acanthopholis | A. eucercus | "[Two] caudal centra." | Nomen dubium |
| Acanthopholis | A. platypus | "Phalanx, caudal centra." | Nomen dubium |
| Acanthopholis | A. macrocercus | "Osteoderms." "Vertebrae, fragmentary skeleton elements." | Reassigned to Syngonosaurus |
| Acanthopholis | A. stereocercus | "Osteoderms." "Vertebrae." | Nomen dubium |
| Eucercosaurus | E. tanyspondylus | "Vertebrae." | |
| Trachodon | T. cantabrigiensis | "Dentary tooth." | Nomen dubium |

#### Saurischians

Saurischians :
| Genus | Species | Locality | Material | Notes | Images |
| Macrurosaurus | M. semnus | | "Caudal vertebrae" | Titanosauriform sauropod or indeterminate macronarian | |

### Pterosaurs

| 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. |
Pterosaurs :
| Genus | Species | Material | Notes |
| Aerodraco | A. sedgwickii | Anterior rostrum | |
| Amblydectes | A. crassidens | Jaw fragments | |
| Amblydectes | A. eurygnathus | Jaw fragments | Possibly a junior synonym of A. crassidens |
| Camposipterus | C. colorhinus | Anterior rostra fragments | |
| Camposipterus | C. nasutus | Partial rostrum | |
| Draigwenia | D. platystomus | Anterior rostrum fragments | Formerly Amblydectes platystomus |
| Lonchodraco | L. machaerorhynchus | | May or may not be referrable to Ikrandraco |
| Lonchodraco | L. microdon | | Junior synonym of L. machaerorhynchus |
| Nicorhynchus | N. capito | Jaw fragments | Possibly synonymous with Coloborhynchus |
| Ornithocheirus | O. simus | | |
| Ornithocheirus | "Ornithocheirus" denticulatus | | |
| Ornithocheirus | "Ornithocheirus" polyodon | | |
| Ornithostoma | O. sedgwicki | Jaw fragments | Azhdarchoid pterosaur |
| Indeterminate azhdarchoid | | Jaw fragments | Likely represents a distinct taxon from Ornithostoma |

### Ichthyosaurs

Ichthyosaurs :
| Genus | Species |
| Cetarthrosaurus | C. walkeri |
| Maiaspondylus | M. cantabrigiensis |
| Pervushovisaurus | P. campylodon |
| Sisteronia | S. seeleyi |

### Lepidosauria

| 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. |
Lepidosauria :
| Genus | Species | Locality | Material | Notes | Images |
| Patricosaurus | P. merocratus | | | Chimeric specimen | |

## Invertebrates
### Ammonites

* Salaziceras salazacense