Hudspeth Formation
# Hudspeth Formation

The Hudspeth Formation is a Cretaceous sedimentary rock formation, found in Oregon of the United States of America. The formation dates to the Albian age of the Early Cretaceous period. During the Albian much of this formation was submerged beneath shallow seas resulting in the preservation of many marine fossils. Pterosaur, dinosaur and marine fossils have been recovered from the formation. It is intertongued with the Gable Creek Formation.

## Fossil content

### Vertebrates

Vertebrates of the Hudspeth Formation :

| Genus | Species | Location | Material | Notes |
| - | - | - | - | - |
| Bennettazhia | B. oregonensis | Oregon | Humerus, two fused dorsal vertebrae, and a partial joint bone | A Tapejaromorpha pterosaur |
| Ornithopoda (Mitchell ornithopod) | Indeterminate | Oregon | Toe bone and a vertebra | First dinosaur described from Oregon (but it was not the first discovered), likely a bloated carcass swept out into the ocean from a coastline in what is now Idaho. Further discoveries suggest it may have been deposited by a mudflow |
| Ornithopoda | Indeterminate | Oregon | Vertebra | Likely the same animal as the Mitchell ornithopod. |
| Plesiosauroidea | Indeterminate | Oregon | A partial skull | A short necked Plesiosauroidea |
| Ichthyosauria | Indeterminate | | Vertebral centra | |
| Scapanorhynchus sp. | | | Teeth | A shark |

### Ammonites

Ammonites of the Hudspeth Formation :

| Genus | Species | Location | Material | Notes |
| - | - | - | - | - |
| Brewericeras | B. hulenensis | Oregon | Shell in siderite nodules | |
| Brewericeras | B. breweri | Oregon | | |
| Leconteites | L. lecontei | Oregon | Shell | |
| Desmoceras | D. alamoense | Oregon | Siderite nodule and shells | Desmoceras is one of the most common Ammonite genera to be found in the Hudspeth Formation |
| Anisoceras | Indeterminate | Oregon | | |
| Anisoceras | A. merriami | Oregon | Coiled shell | |
| Mariella | M. oregonensis | Oregon | Siderite nodule | |
| Anagaudryceras | Indeterminate | Oregon | Siderite nodule | |
| Pseudohelicoceras | P. petersoni | Oregon | | |
| Mortoniceras | M. inflatum | Oregon | | |
| Mortoniceras | M. fallax | Oregon | | |

### Other invertebrates

Other invertebrates of the Hudspeth Formation :

| Genus | Species | Location | Notes | Images |
| - | - | - | - | - |
| Pleuromya | P. russelli | Oregon | | |
| Buchia | Indeterminate | Oregon | | |
| Epiaster | E. californicus | Oregon | | |
| Trigonarca | T. jacksonensis | Oregon | | |
| Goniomya | G. vespera | Oregon | | |
| Sogdianella | S. oregonensis | Oregon | | |
| Euspira | E. conradiana | Oregon | Euspira is still extant though E. conradiana is extinct | An extant Euspira catena |
| Eucorystes | E. platys | Oregon | A type of small crab, also present in Europe | |
