Where: Emery County, Utah (39.0° N, 111.9° W: paleocoordinates 40.4° N, 74.0° W)
• coordinate estimated from map
• small collection-level geographic resolution
When: Mussentuchit Member (Cedar Mountain Formation), Early/Lower Cenomanian (99.6 - 93.5 Ma)
• 4 m below overlying Naturita Fm.
•
•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: "channel"; lithology not reported
Size classes: macrofossils, mesofossils
Primary reference: R. L. Cifelli and S. K. Madsen. 1998. Triconodont mammals from the medial Cretaceous of Utah. Journal of Vertebrate Paleontology 18(2):403-411 [J. Alroy/J. Alroy/M. Carrano]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 14399: authorized by John Alroy, entered by John Alroy on 21.09.1998, edited by Roger Benson and Matthew Carrano
Creative Commons license: CC BY (attribution)
Taxonomic list
Reptilia | |
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"? Polyglyphanodontinae indet." = Polyglyphanodontidae4, Dicothodon moorensis n. gen. n. sp.7, Bicuspidon numerosus9
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Mammalia | |
Jugulator amplissimus Cifelli and Madsen 1998 mammal
Corviconodon utahensis Cifelli and Madsen 1998 mammal
Astroconodon delicatus n. sp. Cifelli and Madsen 1998 mammal | |
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Culicolestes kielanae n. gen. n. sp.3, ? Culicolestes kielanae3, Dakotadens pertritus3, Adelodelphys muizoni2, Sinbadelphys schmidti2
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Cedaromys bestia5, Cedaromys parvus n. sp.5, cf. Paracimexomys perplexus5, cf. Paracimexomys cf. robisoni5, Bryceomys intermedius5
Cedaromys parvus n. sp.5 Eaton and Cifelli 2001 multituberculate holotype M1, OMNH 25747; including two tentatively referred m1s
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Amphibia | |
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