OMNH V695, Mussentuchit (Cretaceous of the United States)

Where: Emery County, Utah (38.7° N, 111.2° W: paleocoordinates 40.0° N, 73.4° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Mussentuchit Member (Cedar Mountain Formation), Early/Lower Cenomanian (99.6 - 93.5 Ma)

• 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.

• bed-level stratigraphic resolution

Environment/lithology: "floodplain"; sandstone

Size classes: macrofossils, mesofossils

Collection methods: bulk,

Primary reference: 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]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 14396: authorized by John Alroy, entered by John Alroy on 21.09.1998, edited by Matthew Carrano, Roger Benson and Philip Mannion

Creative Commons license: CC BY (attribution)

Taxonomic list

• upper member of fm.new 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
Amphibia
 Caudata - Urodela
Scapherpetontidae indet.7 Auffenberg and Goin 1959 salamander
orig. Batrachosauroididae; OMNH 27130, 27394, 27401, 27888, 28086
 Salientia -
Anura indet.7 Fischer von Waldheim 1813 frog
many specimens include articulated individuals
 Temnospondyli - Albanerpetontidae
Albanerpetontidae indet.10 Fox and Naylor 1982 tetrapod
OMNH 27375, 26802, 26738, 26739, 26803, 27378, 27409
Albanerpeton cf. nexuosus10 Estes 1981 tetrapod
OMNH 27413
Mammalia
 Eutriconodonta - Triconodontidae
Jugulator amplissimus5 Cifelli and Madsen 1998 mammal
Astroconodon delicatus5 Cifelli and Madsen 1998 mammal
Corviconodon utahensis5 Cifelli and Madsen 1998 mammal
 Theriamorpha -
Tribosphenida indet.4 mammal
OMNH 26729, 30532, 33238
Culicolestes kielanae4 Cifelli et al. 2016 mammal
OMNH 26727
Sinbadelphys schmidti3 Cifelli 2004 metatherian
Kokopellia juddi n. gen. n. sp. Cifelli 1993 metatherian
OMNH 26361
Dakotadens pertritus n. sp.4 Cifelli et al. 2016 metatherian
 Theriamorpha - Spalacotheriidae
Spalacotheriidae indet.6 Marsh 1887 mammal
Spalacotheridium noblei2 Cifelli and Madsen 1999 mammal
Spalacolestes cretulablatta2 Cifelli and Madsen 1999 mammal
 Multituberculata -
Ameribaatar zofiae8 Eaton and Cifelli 2001 multituberculate
m2, OMNH 33167; M1, 33177 (partial); M2, 33165;
Bryceomys intermedius8 Eaton and Cifelli 2001 multituberculate
m1, OMNH 33174; m2, 26626,26632,33190,33192; M1, 27553; M2, 26679,27453; including tentatively referred m2 (OMNH 26579)
cf. Paracimexomys perplexus8 Eaton and Cifelli 2001 multituberculate
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)
 Multituberculata - Neoplagiaulacidae
? Mesodma sp.8 Jepsen 1940 multituberculate
p4, OMNH 27563
 Multituberculata -
Cedaromys bestia8 Eaton and Nelson 1991 multituberculate
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 parvus8 Eaton and Cifelli 2001 multituberculate
p4, OMNH 27497; m1, 26628,26683,29583,30633; m2, 26627; M1, 33185; M2, 26678; including tentatively referred P4 (OMNH 33161)
cf. Janumys erebros8 multituberculate
P4: OMNH 26640,29573
Janumys erebos n. gen. n. sp.8 Eaton and Cifelli 2001 multituberculate
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
 Multituberculata - Plagiaulacidae
? Plagiaulacidae indet.8 Gill 1872 multituberculate
Reptilia
 Theropoda -
Theropoda "indet. 1"9 Marsh 1881 theropod
teeth, morphotype 1
Theropoda "indet. 2"9 Marsh 1881 theropod
teeth, morphotype 2
Theropoda "indet. 3"9 Marsh 1881 theropod
teeth, morphotype 3
 Theropoda - Dromaeosauridae
Richardoestesia sp.9 Currie et al. 1990 maniraptoran
teeth, morphotype 4
 Ornithischia -
Neoceratopsia indet.1 Sereno 1986 ceratopsian
 Loricata - Goniopholididae
Goniopholididae indet.9 Cope 1875 crocodilian
teeth
 Squamata - Teiidae
Harmodontosaurus emeryensis13 Nydam 2002 squamates
OMNH 28067
 Squamata - Paramacellodidae
Hypostylos sp.15 Wick and Shiller 2020 squamates
OMNH 27711
 Squamata -
Dimekodontosaurus madseni n. gen. n. sp.13 Nydam 2002 squamates
scincoid lizard; OMNH 34560
Coniophis sp.11 Marsh 1892 snake
OMNH 33250 (dorsal vertebra)
Primaderma nessovi n. gen. n. sp.12 Nydam 2000 squamates
platynotan lizard; OMNH 26742
Scincomorpha indet.13 squamates
 Squamata - Polyglyphanodontidae
Bicuspidon numerosus n. gen. n. sp.14
Bicuspidon numerosus n. gen. n. sp.14 Nydam and Cifelli 2002 squamates
OMNH 26743
 Squamata -
Bothriagenys mysterion n. gen. n. sp.13
Bothriagenys mysterion n. gen. n. sp.13 Nydam 2002 squamates
scincomorph lizard; OMNH 28119
Osteichthyes
 Actinopterygii -
Actinopterygii indet.7 Cope 1887 ray-finned fish
OMNH 30173