Cifelli #2 Eolambia caroljonesa Quarry (18.1): Early Cenomanian, Utah
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Reptilia
- Ornithischia
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Ornithischia indet.
Seeley 1888
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| tracks | ||||||||||
| 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 Cretaceous |
| Stage: | Cenomanian | 10 m.y. bin: | Cretaceous 5 |
| Key time interval: | Early Cenomanian | ||
| Age range of interval: | 100.5 - 93.9 m.y. ago |
Stratigraphy
| Geological group: | Dakota | Formation: | Cedar Mountain | Member: | Mussentuchit |
| Local section: | Cifelli-2 | Local bed: | 18.1 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: | mudstone |
| Includes fossils? | Y |
| Environment: | lacustrine delta plain |
| Glacial or sequence phase: | transgressive systems tract |
| Geology comments: a "mudflat-transgressive lag deposition system" with local conditions suggestive of lacustrine deltaic deposition | |
Taphonomy
| Modes of preservation: | trace |
| Degree of concentration: | dispersed |
| Size of fossils: | macrofossils,mesofossils |
| Spatial orientation: | life position |
| Temporal resolution: | snapshot |
| Spatial resolution: | autochthonous |
Collection methods and comments
| Collection methods: | surface (in situ) |
| Reason for describing collection: | taphonomic analysis |
Metadata
| Also known as: | CEU, Eo2, Eolambia II | ||
| Database number: | 73613 | ||
| Authorizer: | M. Carrano | Enterer: | M. Carrano |
| Modifier: | M. Carrano | Research group: | vertebrate |
| Created: | 2007-06-21 13:15:22 | Last modified: | 2022-09-21 12:17:38 |
| Access level: | the public | Released: | 2007-06-21 13:15:22 |
| 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] |