Hudspeth Formation

Last updated
Hudspeth Formation
Stratigraphic range: Albian-Cenomanian
~107.5–96.6  Ma
Type Geological formation
Unit of Mitchell Group
Area Wheeler & Lake Counties, Oregon
Lithology
Primary Mudstone, shale
Location
Coordinates 43°18′N120°06′W / 43.3°N 120.1°W / 43.3; -120.1
Approximate paleocoordinates 42°54′N74°48′E / 42.9°N 74.8°E / 42.9; 74.8
Region Oregon
Country United States
Usa edcp relief location map.png
Green pog.svg
Hudspeth Formation (the United States)
USA Oregon relief location map.svg
Green pog.svg
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]

Contents

Fossil content

Vertebrates

Vertebrates of the Hudspeth Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Bennettazhia [3] B. oregonensisOregonHumerus, two fused dorsal vertebrae, and a partial joint boneA Tapejaromorpha pterosaur
Bennettazhia oregonensis Schematic.png
Ornithopoda (Mitchell ornithopod)IndeterminateOregonToe bone and a vertebraFirst 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 IndeterminateOregonVertebraLikely the same animal as the Mitchell ornithopod. [5]
Plesiosauroidea IndeterminateOregonA partial skullA short necked Plesiosauroidea [6]
Ichthyosauria IndeterminateVertebral centra
Scapanorhynchus sp. [7] TeethA shark

Ammonites

Ammonites of the Hudspeth Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Brewericeras B. hulenensisOregonShell in siderite nodules
B. breweriOregon
Leconteites L. leconteiOregonShell
Desmoceras D. alamoenseOregonSiderite nodule and shells [8] Desmoceras is one of the most common Ammonite genera to be found in the Hudspeth Formation
Gasteropods - Ammonites - Desmoceras sp..JPG
Anisoceras IndeterminateOregon
A. merriamiOregonCoiled shell
Mariella M. oregonensisOregonSiderite nodule
Anagaudryceras IndeterminateOregonSiderite nodule
Pseudohelicoceras P. petersoniOregon
Mortoniceras M. inflatumOregon
Mortoniceras inflatum 01.JPG
M. fallaxOregon

Other invertebrates

Other invertebrates of the Hudspeth Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Pleuromya P. russelliOregon
Buchia IndeterminateOregon
Epiaster E. californicusOregon
Trigonarca T. jacksonensisOregon
Goniomya G. vesperaOregon
Sogdianella S. oregonensisOregon
Euspira E. conradianaOregonEuspira is still extant though E. conradiana is extinct
An extant Euspira catena Euspira catena.jpg
An extant Euspira catena
Eucorystes E. platysOregonA type of small crab, also present in Europe

See also

References

  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. 1 2 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