Lindsay's Site: Early Cenomanian, Utah
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Reptilia
|
||||||||||
|
Siats meekerorum n. gen., n. sp.
Zanno and Makovicky 2013
|
1 individual | |||||||||
| FMNH (Field Museum of Natural History) PR 2716, partial postcranial skeleton of immature individual including portions of the axial column, pelvic girdle and hind limb | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Utah | County: | Emery |
| Coordinates: | 38.9° North, 111.7° West (view map) | ||||
| Paleocoordinates: | 46.1° North, 69.9° West (Wright 2013) | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | outcrop |
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 |
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Approx. 10m below the base of the Naturita (Dakota) Formation
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: | paleosol/pedogenic silty mudstone |
| Includes fossils? | Y |
| Environment: | estuary/bay |
| Geology comments: "tidal flat" | |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | selective quarrying |
| Reason for describing collection: | taxonomic analysis |
Metadata
| Also known as: | Siats meekerorum type | ||
| Database number: | 152628 | ||
| Authorizer: | P. Mannion | Enterer: | J. Tennant |
| Modifier: | M. Carrano | Research group: | vertebrate |
| Created: | 2013-11-28 04:48:17 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2013-11-28 04:48:17 |
| Creative Commons license: | CC0 | ||
Reference information
Primary reference:
| 49074. | L. E. Zanno and P. J. Makovicky. 2013. Neovenatorid theropods are apex predators in the Late Cretaceous of North America. Nature Communications 4:1-9 [P. Mannion/J. Tennant] |
Secondary references:
| 79275 | R. T. Tucker, L. E. Zanno, H. Huang and P. J. Makovicky. 2020. A refined temporal framework for newly discovered fossil assemblages of the upper Cedar Mountain Formation (Mussentuchit Member), Mussentuchit Wash, Central Utah. Cretaceous Research 110:104384 [P. Mannion/G. Varnham/M. Carrano] |