OMNH V868, Mussentuchit : Early/Lower Cenomanian, Utah

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia
Dimekodontosaurus madseni Nydam 2002
Nydam 2002
Reptilia - Teiidae
? Paramacellodidae informal indet. A Estes 1983
Cifelli et al. 1999 1 specimen
OMNH 33889
    = Harmodontosaurus emeryensis n. gen., n. sp. Nydam 2002
Nydam 2002
Reptilia
Primaderma nessovi Nydam 2000
Nydam 2000
Scincomorpha indet. (Camp 1923)
Nydam 2002 1 specimen
Reptilia - Polyglyphanodontidae
Bicuspidon numerosus Nydam and Cifelli 2002
Nydam and Cifelli 2002
Reptilia
Bothriagenys mysterion Nydam 2002
Nydam 2002
Mammalia - Spalacotheriidae
Spalacotheriidae indet. Marsh 1887
Cifelli and Madsen 1999 1 specimen
Spalacolestes inconcinnus n. sp. Cifelli and Madsen 1999
Cifelli and Madsen 1999 5 specimens
Spalacolestes cretulablatta Cifelli and Madsen 1999
Cifelli 1999 21 specimens
Spalacotheridium noblei Cifelli and Madsen 1999
Cifelli 1999 9 specimens
Mammalia
Adelodelphys muizoni Cifelli 2004
Cifelli 2004
Sinbadelphys schmidti Cifelli 2004
Cifelli 2004
Mammalia - Stagodontidae
Pariadens mckennai n. sp. Cifelli 2004
Cifelli 2004 3 specimens
OMNH 33072, holotype left m4; OMNH 33076 (m1) and 33971 (m2 or 3)
Mammalia - Eutriconodonta - Triconodontidae
Astroconodon delicatus Cifelli and Madsen 1998
1 specimen
Mammalia - Multituberculata
Ameribaatar zofiae Eaton and Cifelli 2001
Eaton and Cifelli 2001 4 specimens
ml, OMNH 32990 (partial); m2, 32993; M2, 32989 (posterior fragment), 32991 (partial)
Janumys erebos Eaton and Cifelli 2001
Eaton and Cifelli 2001 2 specimens
cf. Paracimexomys perplexus Eaton and Cifelli 2001
Eaton and Cifelli 2001 2 specimens
cf. Paracimexomys cf. robisoni Eaton and Nelson 1991
Eaton and Cifelli 2001 1 specimen
Bryceomys intermedius n. sp. Eaton and Cifelli 2001
Eaton and Cifelli 2001 7 specimens
including tentatively referred m2
Cedaromys parvus Eaton and Cifelli 2001
Eaton and Cifelli 2001 1 specimen
Cedaromys bestia (Eaton and Nelson 1991)
Eaton and Cifelli 2001 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
Stratigraphic resolution:group of beds
Stratigraphy comments: 8 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: not reported
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:14405
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 15:38:33
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]
1224 R. L. Cifelli and S. K. Madsen. 1999. Spalacotheriid symmetrodonts (Mammalia) from the medial Cretaceous (upper Albian or lower Cenomanian) Mussentuchit local fauna, Cedar Mountain Formation, Utah, USA. Geodiversitas 21(2):167-214 [J. Alroy/J. Alroy/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]
6833 R. L. Nydam. 2000. A new taxon of helodermatid-like lizard from the Albian-Cenomanian of Utah. Journal of Vertebrate Paleontology 20(2):285-294 [J. Alroy/J. Alroy/J. Alroy]
7277 R. L. Nydam. 2002. Lizards of the Mussentuchit Local Fauna (Albian-Cenomanian boundary) and comments on the evolution of the Cretaceous lizard fauna of North America. Journal of Vertebrate Paleontology 22(3):645-660 [J. Alroy/J. Alroy/J. Alroy]
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]