Hudspeth Formation
Geomorphological formation
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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.[2]
Unit ofMitchell Group
AreaWheeler & Lake Counties, Oregon
| Hudspeth Formation | |
|---|---|
| Stratigraphic range: Albian-Cenomanian ~[1] | |
| Type | Geological formation |
| Unit of | Mitchell Group |
| Area | Wheeler & Lake Counties, Oregon |
| Lithology | |
| Primary | Mudstone, shale |
| Location | |
| Coordinates | 43.3°N 120.1°W |
| Approximate paleocoordinates | 42.9°N 74.8°E |
| Region | Oregon |
| Country | United States |
  Hudspeth Formation (the United States)  Hudspeth Formation (Oregon) | |
Fossil content
Vertebrates
| Vertebrates of the Hudspeth Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Bennettazhia[3] | B. oregonensis | Oregon | Humerus and two fused dorsal vertebrae | A Tapejaromorph pterosaur, possible a Caupedactylian[4] |  | |
| Dsungaripteromorpha[4] | Indeterminate | Oregon | Dentary fragment and two teeth[5] | Originally referred to Bennettazhia, later reinterpreted as an indeterminate dsungaripteromorph[4] | ||
| Ornithopoda (Mitchell ornithopod) | Indeterminate | Oregon | Toe bone and a vertebra | First dinosaur described from Oregon (not the first discovered), likely a bloated carcass swept out into the ocean from a coastline in what is now Idaho.[6] Further discoveries suggest it may have been deposited by a mudflow[7] | ||
| Ornithopoda | Indeterminate | Oregon | Vertebra | Likely the same animal as the Mitchell ornithopod.[7] | ||
| Plesiosauroidea | Indeterminate | Oregon | A partial skull | A short necked Plesiosauroidea[8] | ||
| Ichthyosauria | Indeterminate | Vertebral centra | ||||
| Scapanorhynchus sp.[9] | Teeth | A shark | ||||
Ammonites
| Ammonites of the Hudspeth Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Brewericeras | B. hulenensis | Oregon | Shell in siderite nodules | |||
| B. breweri | Oregon | |||||
| Leconteites | L. lecontei | Oregon | Shell | |||
| Desmoceras | D. alamoense | Oregon | Siderite nodule and shells[10] | Desmoceras is one of the most common Ammonite genera to be found in the Hudspeth Formation |  | |
| Anisoceras | Indeterminate | Oregon | ||||
| A. merriami | Oregon | Coiled shell | ||||
| Mariella | M. oregonensis | Oregon | Siderite nodule | |||
| Anagaudryceras | Indeterminate | Oregon | Siderite nodule | |||
| Pseudohelicoceras | P. petersoni | Oregon | ||||
| Mortoniceras | M. inflatum | Oregon |  | |||
| M. fallax | Oregon | |||||
Other invertebrates
| Other invertebrates of the Hudspeth Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | 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 |  | ||
| Eucorystes | E. platys | Oregon | A type of small crab, also present in Europe | |||