Hudspeth Formation

Hudspeth Formation Stratigraphic range: Albian ~113–100 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Geological formation
Unit of
Area	Wheeler & Lake Counties, Oregon
Lithology
Primary	Mudstone, shale
Location
Coordinates	43°18′N 120°06′W / 43.3°N 120.1°W / 43.3; -120.1Coordinates: 43°18′N 120°06′W / 43.3°N 120.1°W / 43.3; -120.1
Approximate paleocoordinates	42°54′N 74°48′E / 42.9°N 74.8°E / 42.9; 74.8
Region	Pacific Northwest  Oregon
Country	United States
Hudspeth Formation (the United States) Hudspeth Formation (Oregon) Show map of the United StatesShow map of OregonShow all

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]

Fossil content[]

Vertebrates[]

Vertebrates of the Hudspeth Formation
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
Bennettazhia[2]	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 (but it was not the first discovered), likely a bloated carcass swept out into the ocean from a coastline in what is now Idaho.[3] Further discoveries suggest it may have been deposited by a mudflow[4]
Ornithopoda	Indeterminate	Oregon		Vertebra	Likely the same animal as the Mitchell ornithopod.[4]
Plesiosauroidea	Indeterminate	Oregon		A partial skull	A short necked Plesiosauroidea[5]
Ichthyosauria	Indeterminate			Vertebral centra
Scapanorhynchus sp.[6]				Teeth	A shark

Ammonites[]

Ammonites of the Hudspeth Formation
Genus	Species	Location	Stratigraphic position	Material	Notes	Images
	B. hulenensis	Oregon		Shell in siderite nodules
	B. breweri	Oregon
	L. lecontei	Oregon		Shell
Desmoceras	D. alamoense	Oregon		Siderite nodule and shells[7]	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
	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
	P. russelli	Oregon
	Indeterminate	Oregon
	E. californicus	Oregon
	T. jacksonensis	Oregon
	G. vespera	Oregon
	S. oregonensis	Oregon
Euspira	E. conradiana	Oregon			Euspira is still extant though E. conradiana is extinct	An extant Euspira catena
	E. platys	Oregon			A type of small crab, also present in Europe

See also[]

• List of pterosaur-bearing stratigraphic units
• Paleontology in Oregon

References[]

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.{{cite web}}: CS1 maint: url-status (link)
• Welton, B.J. 1972. Fossil sharks in Oregon. 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.