OMNH V867 (Cretaceous of the United States)

Where: Emery County County, Utah (38.7° N, 111.3° W: paleocoordinates 40.0° N, 73.4° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Mussentuchit Member (Cedar Mountain Formation), Early/Lower Cenomanian (99.6 - 93.5 Ma)

• Upper 15 m of an unnamed member of the Cedar Mountain Formation, an ash layer in the overlying sites is dated as latest Albian/earliest Cenomanian

•A radiometric age of 98.37 ± 0.07 Ma was obtained by the OMNH from volcanic ash within the Mussentuchit Member (Cifelli and others, 1997, 1999). Additional ages by Garrison and others (2007) ranging from 96.7 ± 0.5 to 98.2 ±0.6 Ma indicate that the Mussentuchit Member was deposited over an interval of 1.5 Ma during the early Cenomanian and supports a correlation with the siliceous marine Mowry Shale to the north, which is well-constrained from 40Ar/39Ar sanidine ages obtained from bentonite beds that bracket the Mowry in Wyoming; the basal Arrow Creek Bentonite is 98.5 ± 0.5 Ma and the capping Clay Spur Bentonite is 97.2 ± 0.7 Ma (Obradovich, 1993; Ogg and Hinnov, 2012; Sprinkel and others, 2012) near the base of the Upper Cretaceous. Tucker et al. 2020 also suggested a likely depositional age of ~96-94Ma for the Musseuntuchit member.

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: mesofossils

Collected by Cifelli

• OMNH (Sam Noble Oklahoma Museum of Natural History) locality V867

Primary reference: J. D. Gardner and R. L. Cifelli. 1999. A primitive snake from the Cretaceous of Utah. In D. M. Unwin (ed.), Cretaceous Fossil Vertebrates. Special Papers in Palaeontology 60:87-100 [R. Benson/R. Benson/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 117467: authorized by Roger Benson, entered by Roger Benson on 21.09.2011, edited by Matthew Carrano

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Theropoda - Elongatoolithidae
Macroelongatoolithus carlylei Jensen 1970 theropod
TMP 98.107.10
 Squamata -
Coniophis sp. Marsh 1892 snake
OMNH 33251 (dorsal vertebra)