Also known as Red Seeps, BYU Loc. 664, UCM Loc. 83288; Jensen's Egg Site
Where: Emery County, Utah (39.2° N, 110.9° W: paleocoordinates 40.4° N, 72.9° W)
• coordinate estimated from map
• small collection-level geographic resolution
When: Mussentuchit Member (Cedar Mountain Formation), Early/Lower Cenomanian (99.6 - 93.5 Ma)
• Exact horizon could not be determined but it appears that the eggshells originated directly below the channel sands and so would occur in the uppermost Cedar Mountain beds.
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•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.
• group of beds-level stratigraphic resolution
Environment/lithology: terrestrial; shale
Size class: macrofossils
Collected by Jones & Jensen in 1965–1966
Collection methods: quarrying, surface (float),
Primary reference: R. P. Ratkevich. 1967. Fossil department. Rocks and Minerals 42(4):282-283 [M. Carrano/M. Carrano]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 52973: authorized by Matthew Carrano, entered by Kaitlin Maguire on 30.08.2005
Creative Commons license: CC BY (attribution)
Taxonomic list
Reptilia | |
Dinosauria indet. dinosaur | |
"Oolithes carlylensis n. sp." = Macroelongatoolithus carlylei
"Oolithes carlylensis n. sp." = Macroelongatoolithus carlylei Jensen 1970 theropod BYU-E 200-201, BYU-VP 3699-3706; UCM 82008
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