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 Stratigraphic position Material Notes Images BennettazhiaGilmore, 1928 B. oregonensis Oregon Humerus and two fused dorsal vertebrae A Tapejaromorph pterosaur, possible a Caupedactylian Dsungaripteromorpha Indeterminate Oregon Dentary fragment and two teeth Originally referred to Bennettazhia, later reinterpreted as an indeterminate dsungaripteromorph 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.Retallack et al., 2018 Further discoveries suggest it may have been deposited by a mudflow OrnithopodaIndeterminateOregonVertebraLikely the same animal as the Mitchell ornithopod. Plesiosauroidea Indeterminate Oregon A partial skull A short necked PlesiosauroideaFremd et al., 2005 Ichthyosauria Indeterminate Vertebral centra Scapanorhynchus sp.Welton, 1972 TeethA 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 shellsDesmoceras 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
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