OMNH V794, Mussentuchit: Early/Lower Cenomanian, Utah

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia
Theropoda informal indet. 1 (Marsh 1881)
Frederickson et al. 2018 7 specimens
teeth, morphotype 1
Theropoda informal indet. 2 (Marsh 1881)
Frederickson et al. 2018 8 specimens
teeth, morphotype 2
Theropoda informal indet. 3 (Marsh 1881)
Frederickson et al. 2018 10 specimens
teeth, morphotype 3
Reptilia - Dromaeosauridae
Richardoestesia sp. Currie et al. 1990
Frederickson et al. 2018 13 specimens
teeth, morphotype 4
Reptilia - Goniopholididae
Goniopholididae indet. Cope 1875
Frederickson et al. 2018 10 specimens
teeth
Reptilia - Polyglyphanodontidae
Bicuspidon numerosus Nydam and Cifelli 2002
Nydam and Cifelli 2002
Mammalia - Multituberculata
Ameribaatar zofiae n. gen., n. sp. Eaton and Cifelli 2001
Eaton and Cifelli 2001 4 specimens
holotype M2, OMNH 33984; m2, 33992; M2, 27583, 27616 (anterior portion), 33984;
Mammalia - Multituberculata - Plagiaulacidae
? Plagiaulacidae indet. Gill 1872
Eaton and Cifelli 2001 1 specimen
Mammalia - Multituberculata
Janumys erebos Eaton and Cifelli 2001
Eaton and Cifelli 2001 3 specimens
Bryceomys intermedius Eaton and Cifelli 2001
Eaton and Cifelli 2001 7 specimens
cf. Paracimexomys perplexus n. sp. Eaton and Cifelli 2001
Eaton and Cifelli 2001 19 specimens
Cedaromys parvus Eaton and Cifelli 2001
Eaton and Cifelli 2001 2 specimens
including tentatively referred m1
Cedaromys bestia (Eaton and Nelson 1991)
Eaton and Cifelli 2001 4 specimens
including tentatively referred M2
Mammalia - Spalacotheriidae
Spalacotheridium noblei Cifelli and Madsen 1999
Cifelli 1999 9 specimens
Spalacolestes cretulablatta Cifelli and Madsen 1999
Cifelli 1999 16 specimens
Mammalia
Sinbadelphys schmidti Cifelli 2004
Cifelli 2004
Adelodelphys muizoni Cifelli 2004
Cifelli 2004
Dakotadens pertritus Cifelli et al. 2016
Cifelli et al. 2016 6 specimens
OMNH 27641, 27640, 27644, 33997–33998, 30588
Mammalia - Eutriconodonta - Triconodontidae
Corviconodon utahensis Cifelli and Madsen 1998
2 specimens
see common names

Geography
Country:United States State/province:Utah County:Emery
Coordinates: 38.7° North, 111.2° West (view map)
Paleocoordinates:40.0° North, 73.4° West
Basis of coordinate:estimated from map
Geographic resolution:small collection
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Cenomanian 10 m.y. bin:Cretaceous 5
Key time interval:Early/Lower Cenomanian
Age range of interval:100.50000 - 93.90000 m.y. ago
Stratigraphy
Geological group:Dakota Formation:Cedar Mountain Member:Mussentuchit
Local section:Kaipa Local bed:2
Local order:bottom to top
Stratigraphic resolution:bed
Stratigraphy comments: 15 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.
Lithology and environment
Primary lithology: mudstone
Includes fossils?Y
Environment:crevasse splay
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Collection methods and comments
Collection excludes:some genera
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Metadata
Database number:14403
Authorizer:J. Alroy, M. Carrano, R. Benson Enterer:J. Alroy, M. Carrano, R. Benson
Modifier:M. Carrano Research group:vertebrate
Created:1998-09-21 00:00:00 Last modified:2023-08-21 15:21:02
Access level:the public Released:1998-09-21 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:
1223. 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]

Secondary references:

1213 R. L. Cifelli. 1999. Therian teeth of unusual design from the mid-Cretaceous (Albian–Cenomanian) Cedar Mountain Formation of Utah. Journal of Mammalian Evolution 6(3):247-270 [J. Alroy/J. Alroy/M. Carrano]
39671 R. L. Cifelli. 2004. Chapter 5: Marsupial Mammals from the Albian–Cenomanian (Early–Late Cretaceous) Boundary, Utah. Bulletin of the American Museum of Natural History 285:62-79 [R. Benson/R. Benson]
60386 R. L. Cifelli, J. E. Cohen, and B. M. Davis. 2016. New tribosphenic mammals from the Mussentuchit Local Fauna (Cedar Mountain Formation, Cenomanian), Utah, USA. Palaeontologia Polonica 67:67-81 [M. Carrano/M. Carrano]
1227 R. L. Cifelli, R. L. Nydam, J. D. Gardner, A. Weil, J. G. Eaton, J. I. Kirkland, and S. K. Madsen. 1999. Medial Cretaceous vertebrates from the Cedar Mountain Formation, Emery County, Utah: the Mussentuchit local fauna. In D. D. Gillette (ed.), Vertebrate Paleontology in Utah. Utah Geological Survey Miscellaneous Publication 99-1:219-242 [J. Alroy/J. Alroy/M. Carrano]
6099 J. G. Eaton and R. L. Cifelli. 2001. Multituberculate mammals from near the Early-Late Cretaceous boundary, Cedar Mountain Formation, Utah. Acta Palaeontologica Polonica 46(4):453-518 [J. Alroy/J. Alroy/M. Carrano]
70607 J. A. Frederickson, M. H. Engel, and R. L. Cifelli. 2018. Niche partitioning in theropod dinosaurs: diet and habitat preference in predators from the uppermost Cedar Mountain Formation (Utah, U.S.A.). Scientific Reports 8(1):17872:1-13 [M. Carrano/M. Carrano]
6714 R. L. Nydam and R. L. Cifelli. 2002. A new teiid lizard from the Cedar Mountain Formation (Albian-Cenomanian boundary) of Utah. Journal of Vertebrate Paleontology 22(2):276-285 [J. Alroy/J. Alroy/J. Alroy]