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Geomorphological 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 .[ 2]
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 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 [ edit ]
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
^ 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 .
^ "Bedrock geology of the Mitchell Quadrangle, Wheeler County, Oregin" (PDF) . 1971. Retrieved 2020-07-04 .
^ Gilmore, 1928
^ Retallack et al., 2018
^ 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 .
^ Fremd et al., 2005
^ Welton, 1972
^ "Condon Collection's Searchable Database" . University of Oregon . Archived from the original on July 5, 2020. Retrieved July 4, 2020 .
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 . S2CID 91379584 .
Fremd, Ted; Retallack, Gregory; Springer, Dale; Scotchmoor, Judy (2005). "Oregon, U.S." The Paleontology Portal . Retrieved 2020-07-04 .
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 .