Hudspeth 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.[1]

Hudspeth Formation
Stratigraphic range: Albian
~113–100 Ma
TypeGeological formation
Unit ofMitchell Group
AreaWheeler & Lake Counties, Oregon
Lithology
PrimaryMudstone, shale
Location
Coordinates43.3°N 120.1°W / 43.3; -120.1
Approximate paleocoordinates42.9°N 74.8°E / 42.9; 74.8
RegionPacific Northwest
 Oregon
Country United States
Hudspeth Formation (the United States)
Hudspeth Formation (Oregon)

Fossil content

Vertebrates

Vertebrates of the Hudspeth Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Bennettazhia[2] B. oregonensis Oregon Humerus, two fused dorsal vertebrae, and a partial joint bone A Tapejaromorpha pterosaur
Ornithopoda Indeterminate Oregon Toe bone First and only dinosaur from Oregon, likely a bloated carcass swept out into the ocean[3]
Plesiosauroidea Indeterminate Oregon A partial skull A short necked Plesiosauroidea[4]
Ichthyosauria Indeterminate Vertebral centra
Scapanorhynchus sp.[5] Teeth A shark

Ammonites

Ammonites of the Hudspeth Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Brewericeras B. hulenensis Oregon Shell in siderite nodules
B. breweri Oregon
Leconteites L. lecontei Oregon Shell
Desmoceras D. alamoense Oregon Siderite nodule and shells[6] 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
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
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

References

  1. "Bedrock geology of the Mitchell Quadrangle, Wheeler County, Oregin" (PDF). 1971. Retrieved 2020-07-04.
  2. Gilmore, 1928
  3. Retallack et al., 2018
  4. Fremd et al., 2005
  5. Welton, 1972
  6. "Condon Collection's Searchable Database". Retrieved July 4, 2020.

Bibliography

  • Retallack, Gregory J.; Jessica M. Theodor; Edward B. Davis; Samantha S. Hopkins, and Paul Z. Barrett. 2018. First Oregon dinosaur (Ornithopoda) from Early Cretaceous (Albian) of Oregon, U.S.A.. Journal of Vertebrate Paleontology .. 1-5.
  • Fremd, Ted; Retallack, Gregory; Springer, Dale; Scotchmoor, Judy (2005). "The Paleontology Portal: Oregon, U.S." paleoportal.org. 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. 1–5.
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