Robison Eggshell Site (CM): Early/Lower Cenomanian, Utah
collected by Robison 1990-1991
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Osteichthyes
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Osteichthyes indet.
Huxley 1880
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Fiorillo 1999 | |||||||||
Mammalia
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Mammalia indet.
Linnaeus 1758
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2 specimens | |||||||||
Reptilia
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Naomichelys sp.
Hay 1908
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Fiorillo 1999 | |||||||||
Reptilia
- Testudines
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Chelonia indet.
(Latreille 1800)
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Fiorillo 1999 | |||||||||
synonym of Testudines | ||||||||||
Reptilia
- Testudines
- Trionychidae
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Trionychidae indet.
Gray 1825
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Fiorillo 1999 | 1 specimen | ||||||||
Reptilia
- Lacertilia
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Lacertilia indet.
Owen 1842
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Fiorillo 1999 | 1 specimen | ||||||||
Reptilia
- Theropoda
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aff. Theropoda informal indet. A
Marsh 1881
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Fiorillo 1999 | 1 specimen | ||||||||
see Fiorillo & Currie 1994 | ||||||||||
Theropoda indet.
Marsh 1881
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Fiorillo 1999 | |||||||||
Reptilia
- Tyrannosauridae
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cf. Tyrannosauridae indet.
Osborn 1906
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Fiorillo 1999 | 1 specimen | ||||||||
Reptilia
- Dromaeosauridae
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Dromaeosaurinae indet.
Matthew and Brown 1922
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Fiorillo 1999 | |||||||||
Velociraptorinae indet.
Barsbold 1983
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Fiorillo 1999 | |||||||||
Reptilia
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"Paronychodon" sp.
Cope 1876
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Fiorillo 1999 | 1 specimen | ||||||||
Reptilia
- Elongatoolithidae
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Dinosauria indet.
(Owen 1842)
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= Elongatoolithidae indet.
Zhao 1975
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Fiorillo 1999 | |||||||||
Reptilia
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Ornithopoda indet.
Marsh 1881
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Fiorillo 1999 | |||||||||
Reptilia
- Spheroolithidae
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Dinosauria indet.
(Owen 1842)
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= Spheroolithidae indet.
Zhao 1979
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Fiorillo 1999 | |||||||||
Reptilia
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? Atoposauridae indet.
(Gervais 1871)
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Fiorillo 1999 | |||||||||
= Mesoeucrocodylia indet.
Whetstone and Whybrow 1983
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Tennant et al. 2016 | |||||||||
? Bernissartia sp.
Dollo 1883
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Fiorillo 1999 | |||||||||
Reptilia
- Crocodylia
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Crocodylia indet.
(Owen 1842)
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Reptilia
- Pholidosauridae
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? Pholidosauridae indet.
von Zittel and Eastman 1902
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Fiorillo 1999 | |||||||||
Amphibia
- Temnospondyli
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Anura indet.
(Fischer von Waldheim 1813)
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Fiorillo 1999 | 1 specimen | ||||||||
Actinopteri
- Amiiformes
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Amiiformes indet.
Hay 1929
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Fiorillo 1999 | |||||||||
Actinopteri
- Lepisosteiformes
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Lepidotes sp.
Agassiz 1832
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Fiorillo 1999 | |||||||||
Actinopteri
- Pycnodontiformes
- Pycnodontidae
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Pycnodontidae indet.
(Agassiz 1833)
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Fiorillo 1999 | |||||||||
Actinopteri
- Aulopiformes
- Enchodontidae
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Enchodus sp.
Agassiz 1835
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Fiorillo 1999 | |||||||||
Chondrichthyes
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Chondrichthyes indet.
Huxley 1880
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Fiorillo 1999 | |||||||||
Chondrichthyes
- Rajiformes
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Pseudohypolophus sp.
Cappetta and Case 1975
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Fiorillo 1999 | |||||||||
Chondrichthyes
- Orectolobiformes
- Orectolobidae
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Cretorectolobus sp.
Case 1978
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Fiorillo 1999 | 1 specimen | ||||||||
Chondrichthyes
- Hybodontiformes
- Hybodontidae
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Hybodus sp.
Agassiz 1834
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Fiorillo 1999 | |||||||||
see common names |
Geography
Country: | United States | State/province: | Utah | County: | Emery |
Coordinates: | 39.1° North, 111.0° West (view map) | ||||
Paleocoordinates: | 40.3° North, 73.1° 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 |
*International age/stage: | Beriasian - Danian | ||
Key time interval: | Early/Lower Cenomanian | ||
Age range of interval: | 100.50000 - 93.90000 m.y. ago | ||
* legacy (obsolete) database fields |
Stratigraphy
Geological group: | Dakota | Formation: | Cedar Mountain | Member: | Mussentuchit |
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: Tucker et al. 2020: sedimentary history of the Mussentuchit Member within the region of Mussentuchit Wash, Central Utah and compare these data with previous approaches. This study finds that emplacement of contemporaneous volcanilithics occurred in two distinct phases. The first phase occurred no older than 96 Ma, and a subsequent younger phase occurred no older than 94 Ma.
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. |
Lithology and environment
Primary lithology: | siltstone |
Secondary lithology: | mudstone |
Includes fossils? | Y |
Includes fossils? | Y |
Lithology description: "a variable stilstone-mudstone interval" | |
Environment: | "floodplain" |
Geology comments: broad alluvial floodplain |
Taphonomy
Modes of preservation: | body |
Degree of concentration: | concentrated |
Size of fossils: | mesofossils |
Disassociated major elements: | many |
Disassociated minor elements: | many |
Fragmentation: | frequent |
Bioerosion: | occasional |
Feeding/predation traces: | gastric dissolution |
Collection methods and comments
Collection methods: | bulk,surface (in situ),sieve,field collection | ||
Reason for describing collection: | general faunal/floral analysis | ||
Museum repositories: | CM | ||
Collectors: | Robison | Collection dates: | 1990-1991 |
Metadata
Also known as: | Egg Shell Quarry; OMNH V820 | ||
Database number: | 22679 | ||
Authorizer: | A. Behrensmeyer, P. Mannion, M. Carrano | Enterer: | A. Behrensmeyer, P. Mannion, M. Carrano |
Modifier: | M. Carrano | ||
Created: | 2001-04-23 01:00:00 | Last modified: | 2023-08-21 15:19:38 |
Access level: | the public | Released: | 2001-04-23 01:00:00 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
62832. | M. E. Nelson and J. H. Madsen. 1985. Early Cretaceous mammals from central Utah. Geological Society of America, Rocky Mountain Section, Abstracts with Programs 17(4):258 [M. Carrano/M. Carrano] |
Secondary references:
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] | |
13288 | ETE | A. R. Fiorillo. 1999. Non-mammalian microvertebrate remains from the Robison Eggshell site, Cedar Mountain Formation (Lower Cretaceous), Emery County, Utah. In D. D. Gillette (ed.), Vertebrate Paleontology in Utah, Utah Geological Survey Miscellaneous Publication 99-1:259-268 [M. Carrano/M. Carrano/M. Carrano] |
57899 | J. I. Kirkland, R. L. Cifelli, B. B. Britt, D. L. Burge, F. L. DeCourten, J. G. Eaton, and J. M. Parrish. 1999. Distribution of vertebrate faunas in the Cedar Mountain Formation, east-central Utah. In D. D. Gillette (ed.), Vertebrate Paleontology in Utah. Utah Geological Survey Miscellaneous Publication 99(1):201-218 [P. Barrett/T. Cleary/M. Carrano] | |
32617 | ETE | J. I. Kirkland and S. K. Madsen. 2007. The Lower Cretaceous Cedar Mountain Formation, Eastern Utah: the view up an always interesting learning curve. Utah Geological Association Publication 35 1-108 [M. Carrano/M. Carrano/M. Carrano] |
15257 | ETE | M. E. Nelson and D. M. Crooks. 1987. Stratigraphy and paleontology of the Cedar Mountain Formation (Lower Cretaceous), eastern Emery County, Utah. In W. R. Averett (ed.), Paleontology and Geology of the Dinosaur Triangle: Guidebook for 1987 Field Trip. Museum of Western Colorado, Grand Junction 55-63 [M. Carrano/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] |