OMNH V695, Mussentuchit: Early/Lower Cenomanian, Utah

List of taxa
Where & when
Taphonomy & methods
Metadata & references
Taxonomic list
Amphibia - Temnospondyli - Albanerpetontidae
Albanerpetontidae indet. Fox and Naylor 1982
Gardner 1999 7 specimens
OMNH 27375, 26802, 26738, 26739, 26803, 27378, 27409
Albanerpeton cf. nexuosus Estes 1981
Gardner 1999 1 specimen
OMNH 27413
Amphibia - Temnospondyli
Anura indet. (Fischer von Waldheim 1813)
Cifelli et al. 1999
many specimens include articulated individuals
Amphibia - Temnospondyli - Urodela
Scapherpetontidae indet. (Auffenberg and Goin 1959)
Cifelli et al. 1999
orig. Batrachosauroididae; OMNH 27130, 27394, 27401, 27888, 28086
Tribosphenida indet. McKenna 1975
Cifelli et al. 2016 3 specimens
OMNH 26729, 30532, 33238
Tribotheria indet. Butler 1978
4 specimens
    = Dakotadens pertritus n. sp. Cifelli et al. 2016
Cifelli et al. 2016
OMNH 33247, 27544, 26731, 27509
Sinbadelphys schmidti Cifelli 2004
Cifelli 2004
Kokopellia juddi n. gen., n. sp. Cifelli 1993
1 individual
OMNH 26361
Culicolestes kielanae Cifelli et al. 2016
Cifelli et al. 2016 1 specimen
OMNH 26727
Mammalia - Spalacotheriidae
Spalacotheriidae indet. Marsh 1887
Cifelli and Madsen 1999
Symmetrodonta indet. Simpson 1925
    = Spalacotheridium noblei Cifelli and Madsen 1999
Cifelli 1999
(in part); "S. n. sp." of Kirkland et al. 1997
Symmetrodonta indet. Simpson 1925
    = Spalacolestes cretulablatta Cifelli and Madsen 1999
Cifelli 1999
(in part;) "Spalacotheroides sp." of Kirkland et al. 1997
Mammalia - Multituberculata
cf. Janumys erebros
Eaton and Cifelli 2001 2 specimens
P4: OMNH 26640,29573
Janumys erebos n. gen., n. sp. Eaton and Cifelli 2001
Eaton and Cifelli 2001 17 specimens
OMNH 26623 (holotype M1); referred m1: OMNH 27434,27435,27455,27499,29586,29591,33172, 33175,33183,33184,34019; m2: 33160; MI: 26619, 27565,29589,33173
Mammalia - Multituberculata - Plagiaulacidae
Multituberculata indet. Cope 1884
1 specimen
    = ? Plagiaulacidae indet. Gill 1872
Eaton and Cifelli 2001
p4: OMNH 33163
Mammalia - Multituberculata
cf. Paracimexomys perplexus Eaton and Cifelli 2001
Eaton and Cifelli 2001
m1: OMNH 26615, 26616, 29592, 29594, 29596, 33176, 33179, 33181; P4, 26642; M1, 26624, 26674, 27450, 27451, 27516, 27517, 29574; including one tentatively referred M2 (27561)
Bryceomys intermedius Eaton and Cifelli 2001
Eaton and Cifelli 2001 9 specimens
m1, OMNH 33174; m2, 26626,26632,33190,33192; M1, 27553; M2, 26679,27453; including tentatively referred m2 (OMNH 26579)
Mammalia - Multituberculata - Neoplagiaulacidae
? Mesodma sp. Jepsen 1940
Eaton and Cifelli 2001 1 specimen
p4, OMNH 27563
Mammalia - Multituberculata
Cedaromys bestia (Eaton and Nelson 1991)
Eaton and Cifelli 2001 18 specimens
lower incisors, OMNH 28505, 28512; p4, 26636, 29582; m1, 26617 (partial); 26620, 26622 (partial), 27498, 29587, 33178; m2, 33186; P4, 30634, 33159; M1, 27564, 33178, 33180; M2, 27538,29576
Cedaromys parvus Eaton and Cifelli 2001
Eaton and Cifelli 2001 9 specimens
p4, OMNH 27497; m1, 26628,26683,29583,30633; m2, 26627; M1, 33185; M2, 26678; including tentatively referred P4 (OMNH 33161)
Ameribaatar zofiae Eaton and Cifelli 2001
Eaton and Cifelli 2001 2 specimens
m2, OMNH 33167; M1, 33177 (partial); M2, 33165;
Mammalia - Eutriconodonta - Triconodontidae
Triconodonta indet. Osborn 1888
    = Jugulator amplissimus Cifelli and Madsen 1998
Cifelli and Madsen 1998
Triconodonta indet. Osborn 1888
    = Corviconodon utahensis Cifelli and Madsen 1998
Cifelli and Madsen 1998
Triconodonta indet. Osborn 1888
    = Astroconodon delicatus Cifelli and Madsen 1998
Cifelli and Madsen 1998
"A. n sp." of Kirkland et al. 1997
Reptilia - Goniopholididae
Goniopholididae indet. Cope 1875
Frederickson et al. 2018 10 specimens
Neoceratopsia indet. Sereno 1986
Chinnery et al. 1998 1 specimen
Theropoda informal indet. 1 (Marsh 1881)
Frederickson et al. 2018 11 specimens
teeth, morphotype 1
Theropoda informal indet. 2 (Marsh 1881)
Frederickson et al. 2018 12 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 6 specimens
teeth, morphotype 4
Scincomorpha indet. Camp 1923
Nydam 2002
Bothriagenys mysterion n. gen., n. sp. Nydam 2002
Nydam 2002 1 specimen
scincomorph lizard; OMNH 28119
Reptilia - Polyglyphanodontidae
Teiidae indet. Gray 1827
Cifelli et al. 1999 1 specimen
OMNH 26743
    = Bicuspidon numerosus n. gen., n. sp. Nydam and Cifelli 2002
Nydam and Cifelli 2002
Reptilia - Teiidae
Teiidae indet. Gray 1827
Cifelli et al. 1999 1 specimen
OMNH 28067
    = Harmodontosaurus emeryensis Nydam 2002
Nydam 2002
Reptilia - Paramacellodidae
Scincidae indet. Gray 1825
Cifelli et al. 1999 1 specimen
OMNH 27711
    = cf. Pseudosaurillus sp. Hoffstetter 1967
Nydam 2002
paramacellodid lizard
    = Hypostylos sp. Wick and Shiller 2020
Wick and Shiller 2020
Dimekodontosaurus madseni n. gen., n. sp. Nydam 2002
Nydam 2002 1 specimen
scincoid lizard; OMNH 34560
Coniophis sp. Marsh 1892
Gardner and Cifelli 1999 1 specimen
nomen dubium belonging to Serpentes
OMNH 33250 (dorsal vertebra)
Necrosauridae indet. Hoffstetter 1943
Cifelli and Nydam 1995 1 specimen
platynotan lizard; OMNH 26742
    = Primaderma nessovi n. gen., n. sp. Nydam 2000
Nydam 2000
Actinopterygii indet. (Cope 1887)
Cifelli et al. 1999
OMNH 30173
see common names

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:based on political unit
Geographic resolution:small collection
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Cenomanian 10 m.y. bin:Cretaceous 5
Key time interval:Early/Lower Cenomanian
Age range of interval:99.60000 - 93.50000 m.y. ago
Geological group:Dakota Formation:Cedar Mountain Member:Mussentuchit
Local section:Kaipa Local bed:1
Local order:bottom to top
Stratigraphic resolution:bed
Stratigraphy comments: 19 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:"cross stratification" sandstone
Includes fossils?Y
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Disassociated major elements:some
Disassociated minor elements:some
Collection methods and comments
Collection excludes:some genera
Collection methods:bulk,field collection
Reason for describing collection:general faunal/floral analysis
Taxonomic list comments:upper member of locality presumably not known to Eaton and Nelson 1991see map of Cifelli and Madsen 1998dated ash of Cifelli et al. 1997 is directly associated with this locality: Cifelli et al. 1999
Database number:14396
Authorizer:J. Alroy, R. Benson, M. Carrano, P. Mannion Enterer:J. Alroy, P. Mannion, R. Benson, M. Carrano
Modifier:M. Carrano Research group:vertebrate
Created:1998-09-21 00:00:00 Last modified:2023-08-21 15:42:32
Access level:the public Released:1998-09-21 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:

1210. R. L. Cifelli. 1993. Early Cretaceous mammal from North America and the evolution of marsupial dental characters. Proceedings of the National Academy of Sciences, USA 90(20):9413-9416 [J. Alroy/J. Alroy/M. Carrano]

Secondary references:

14087ETE B. J. Chinnery, T. R. Lipka, J. I. Kirkland, J. M. Parrish, and M. K. Brett-Surman. 1998. Neoceratopsian teeth from the Lower to Middle Cretaceous of North America. In S. G. Lucas, J. I. Kirkland, J. W. Estep (eds.), Lower and Middle Cretaceous Terrestrial Ecosystems, New Mexico Museum of Natural History and Science Bulletin 14:297-302 [M. Carrano/M. Carrano/M. Carrano]
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]
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]
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]
7575 R. L. Cifelli and R. L. Nydam. 1995. Primitive, helodermatid-like platynotan from the Early Cretaceous of Utah. Herpetologica 51(3):286-291 [J. Alroy/J. Alroy/J. Alroy]
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]
6845 J. D. Gardner. 1999. New albanerpetontid amphibians from the Albian to Coniacian of Utah, USA—bridging the gap. Journal of Vertebrate Paleontology 19(4):632-638 [J. Alroy/J. Alroy/M. Carrano]
37785 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]
14365 Z. Kielan-Jaworowska, R. L. Cifelli, and Z.-X. Luo. 2004. Mammals from the age of dinosaurs: Origins, evolution, and structure. Columbia University Press, New York 1-630 [R. Whatley/R. Whatley/R. Whatley]
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]
72588 S. L. Wick and T. A. Shiller, II. 2020. New taxa among a remarkably diverse assemblage of fossil squamates from the Aguja formation (lower Campanian) of west Texas. Cretaceous Research 114:104516:1-27 [P. Mannion/P. Mannion/M. Carrano]