Earth:Hudspeth Formation
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| Hudspeth Formation Stratigraphic range: Albian-Cenomanian ~107.5–96.6 Ma [1] | |
|---|---|
| Type | Geological formation |
| Unit of | Mitchell Group |
| Area | Wheeler & Lake Counties, Oregon |
| Lithology | |
| Primary | Mudstone, shale |
| Location | |
| Coordinates | [ ⚑ ] : 43°18′N 120°06′W / 43.3°N 120.1°W |
| Paleocoordinates | [ ⚑ ] 42°54′N 74°48′E / 42.9°N 74.8°E |
| Region | Pacific Northwest Oregon |
| Country |  United States |
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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]
Fossil content
Vertebrates
| Vertebrates of the Hudspeth Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
| Bennettazhia[3] | 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.[4] Further discoveries suggest it may have been deposited by a mudflow[5] | ||
| Ornithopoda | Indeterminate | Oregon | Vertebra | Likely the same animal as the Mitchell ornithopod.[5] | ||
| Plesiosauroidea | Indeterminate | Oregon | A partial skull | A short necked Plesiosauroidea[6] | ||
| Ichthyosauria | Indeterminate | Vertebral centra | ||||
| Scapanorhynchus sp.[7] | 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[8] | 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 | |||
See also
- List of pterosaur-bearing stratigraphic units
- Paleontology in Oregon
References
- ↑ Surpless, K. D.; Gulliver, K. D. H. (2018). "Provenance Analysis of the Ochoco Basin, Central Oregon: A Window Into the Late Cretaceous Paleogeography of the Northern U.S. Cordillera". Tectonics, Sedimentary Basins, and Provenance: A Celebration of the Career of William R. Dickinson. Geological Society of America. doi:10.1130/2018.2540(11). ISBN 9780813725406. https://digitalcommons.trinity.edu/cgi/viewcontent.cgi?article=1037&context=geo_faculty.
- ↑ "Bedrock geology of the Mitchell Quadrangle, Wheeler County, Oregin". 1971. https://www.oregongeology.org/pubs/B/B-072.pdf.
- ↑ Gilmore, 1928
- ↑ Retallack et al., 2018
- ↑ 5.0 5.1 Strommer, Kristin (July 14, 2021). "UO-led team uncovers new pieces of Oregon's dinosaur puzzle". https://around.uoregon.edu/content/uo-led-team-uncovers-new-pieces-oregons-dinosaur-puzzle.
- ↑ Fremd et al., 2005
- ↑ Welton, 1972
- ↑ "Condon Collection's Searchable Database". http://paleo.uoregon.edu/condon/.[|permanent dead link|dead link}}]
Bibliography
- Retallack, Gregory J.; Theodor, Jessica M.; Davis, Edward B.; Hopkins, Samantha S.; Barrett, Paul Z. (2018). "First Oregon dinosaur (Ornithopoda) from Early Cretaceous (Albian) of Oregon, U.S.A.". Journal of Vertebrate Paleontology. doi:10.1080/02724634.2018.1486847. https://figshare.com/articles/journal_contribution/7206707.
- Welton, B.J (1972). "Fossil sharks in Oregon". The Ore Bin 34: 161–170.
- Gilmore, C.W (1928). "A new pterosaurian reptile from the marine Cretaceous of Oregon". Proceedings of the United States National Museum 73 (2745): 1–5. doi:10.5479/si.00963801.73-2745.1.
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