Cifelli #2 Eolambia caroljonesa Quarry (22.2): Early/Lower Cenomanian, Utah

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
cf. Baibisha sp.
2 elements
Reptilia
Eolambia caroljonesa Kirkland 1998
4 individuals
Reptilia - Hypsilophodontidae
Hypsilophodontidae indet. Dollo 1882
1 element
Reptilia
cf. Paronychodon sp. Cope 1876
1 element
Reptilia - Dromaeosauridae
Dromaeosauridae indet. Colbert and Russell 1969
1 element
listed as Dromaeosaurinae in Fig. 14
Richardoestesia cf. isosceles Sankey 2001
2 elements
Reptilia
Atoposauridae indet. (Gervais 1871)
8 elements
    = Mesoeucrocodylia indet. Whetstone and Whybrow 1983
Tennant et al. 2016
Eusuchia indet. Huxley 1875
9 elements
Bernissartia informal sp. 1 Dollo 1883
1 element
Actinopteri
Neopterygii indet. Regan 1923
27 elements
Actinopteri - Lepisosteiformes
cf. Lepidotes sp. Agassiz 1832
2 elements
Actinopteri - Lepisosteiformes - Lepisosteidae
Lepisosteus sp. Agassiz 1843
Actinopteri - Amiiformes
Amiiformes indet. Hay 1929
1 element
see common names

Geography
Country:United States State/province:Utah County:Emery
Coordinates: 38.7° North, 111.3° West (view map)
Paleocoordinates:40.0° North, 73.4° West
Basis of coordinate:stated in text
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:99.60000 - 93.50000 m.y. ago
Stratigraphy
Geological group:Dakota Formation:Cedar Mountain Member:Mussentuchit
Local section:Cifelli-2 Local bed:22.2 m
Local order:bottom to top
Stratigraphic resolution:bed
Stratigraphy comments: 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:pebbly carbonaceous mudstone
Includes fossils?Y
Environment:channel lag
Glacial or sequence phase:transgressive systems tract
Geology comments: a "mudflat-transgressive lag deposition system" with local conditions suggestive of lacustrine final deposition as a regressive lag
Taphonomy
Modes of preservation:body,replaced with calcite,replaced with silica,replaced with pyrite
Degree of concentration:concentrated
Size of fossils:macrofossils,mesofossils
Preservation of anatomical detail:good
Disassociated major elements:some
Disassociated minor elements:some
Fragmentation:occasional
Collection methods and comments
Collection methods:selective quarrying,surface (in situ),mechanical,field collection
Reason for describing collection:taphonomic analysis
Metadata
Also known as:CEUM locality 42em432v, Eolambia II, Eo2
Database number:73612
Authorizer:M. Carrano, P. Mannion Enterer:M. Carrano, P. Mannion
Modifier:M. Carrano Research group:vertebrate
Created:2007-06-21 13:07:56 Last modified:2022-09-21 12:22:02
Access level:the public Released:2007-06-21 13:07:56
Creative Commons license:CC BY
Reference information

Primary reference:

24682.ETE J. R. Garrison, Jr., D. B. Brinkman, D. J. Nichols, P. Layer, D. L. Burge and D. Thayn. 2007. A multidisciplinary study of the Lower Cretaceous Cedar Mountain Formation, Mussentuchit Wash, Utah: a determination of the paleoenvironment and paleoecology of the Eolambia caroljonesa dinosaur quarry. Cretaceous Research 28:461-494 [M. Carrano/M. Carrano]

Secondary references:

78573 A. T. McDonald, J. Bird, J. I. Kirkland and P. Dodson. 2012. Osteology of the basal hadrosauroid Eolambia caroljonesa (Dinosauria: Ornithopoda) from the Cedar Mountain Formation of Utah. PLoS One 7(10):e45712:1-38 [M. Carrano/M. Carrano]
59838 J. P. Tennant, P. D. Mannion, and P. Upchurch. 2016. Evolutionary relationships and systematics of Atoposauridae (Crocodylomorpha: Neosuchia): implications for the rise of Eusuchia. Zoological Journal of the Linnean Society 177:854-936 [P. Mannion/P. Mannion]