Hudspeth Formation

Hudspeth Formation
Stratigraphic range: Albian-Cenomanian
~107.5–96.6 Ma [1]
TypeGeological formation
Unit ofMitchell Group
AreaWheeler & Lake Counties, Oregon
Lithology
PrimaryMudstone, shale
Location
Coordinates43°18′N 120°06′W / 43.3°N 120.1°W / 43.3; -120.1
Approximate paleocoordinates42°54′N 74°48′E / 42.9°N 74.8°E / 42.9; 74.8
RegionPacific Northwest
 Oregon
Country United States
Hudspeth Formation is located in the United States
Hudspeth Formation
Hudspeth Formation (the United States)
Hudspeth Formation is located in Oregon
Hudspeth Formation
Hudspeth Formation (Oregon)

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

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Vertebrates

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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 (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

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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

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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
An extant Euspira catena
Eucorystes E. platys Oregon A type of small crab, also present in Europe

See also

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References

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  1. ^ 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". In Ingersoll, R.V.; Graham, S.A.; Lawton, T.F. (eds.). 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.
  2. ^ "Bedrock geology of the Mitchell Quadrangle, Wheeler County, Oregin" (PDF). 1971. Retrieved 2020-07-04.
  3. ^ Gilmore, 1928
  4. ^ Retallack et al., 2018
  5. ^ a b Strommer, Kristin (July 14, 2021). "UO-led team uncovers new pieces of Oregon's dinosaur puzzle". University of Oregon. Retrieved July 15, 2021.
  6. ^ Fremd et al., 2005
  7. ^ Welton, 1972
  8. ^ "Condon Collection's Searchable Database". University of Oregon. Archived from the original on July 5, 2020. Retrieved July 4, 2020.

Bibliography

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