Thorhill Creek: Santonian, Canada
collected 1974
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Reptilia
- Plesiosauria
- Polycotylidae
|
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Dolichorhynchops informal sp. ROM 29010
Williston 1902
|
1 individual | |||||||||
| ROM 29010 | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Canada | State/province: | Manitoba | County: | Division No. 3 |
| Coordinates: | 49.2° North, 98.1° West (view map) | ||||
| Paleocoordinates: | 51.4° North, 59.7° West | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | small collection |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Stage: | Santonian | 10 m.y. bin: | Cretaceous 6 |
| Key time interval: | Santonian | ||
| Age range of interval: | 86.30000 - 83.60000 m.y. ago |
Stratigraphy
| Geological group: | Colorado | Formation: | Niobrara | Member: | Smoky Hill Chalk |
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: "We were unable to determine the exact stratigraphic level of the ROM specimen within the formation; however, the chalky matrix and the geographical location, as well as the preservation of the bones, suggests that the specimen is likely from the Chalky Member, which is the upper half of the formation. The estimated age for the ROM specimen, based on this assumption, is Santonian to the earliest Campanian (McNeil and Caldwell, 1981)." | |||||
Lithology and environment
| Primary lithology: | gray mudstone |
| Includes fossils? | Y |
| Lithology description: "The little remaining matrix still adhering to the specimen is a chalky mudstone and ivory to grey in color." | |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | good |
| Abundance in sediment: | rare |
| Fragmentation: | occasional |
| Spatial resolution: | parautochthonous |
Collection methods and comments
| Collection methods: | survey of museum collection |
| Collection size: | 1 individuals |
| Reason for describing collection: | general faunal/floral analysis |
| Museum repositories: | ROM | Collection dates: | 1974 |
Metadata
| Database number: | 107803 | ||
| Authorizer: | M. Carrano | Enterer: | H. Street |
| Modifier: | P. Mannion | Research group: | vertebrate |
| Created: | 2011-04-16 07:05:26 | Last modified: | 2023-08-02 07:35:49 |
| Access level: | the public | Released: | 2011-04-16 07:05:26 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 35853. | ETE | T. Sato, X.-C. Wu, A. Tirabasso and P. Bloskie. 2011. Braincase of a polycotylid plesiosaur (Reptilia: Sauropterygia) from the Upper Cretaceous of Manitoba, Canada. Journal of Vertebrate Paleontology 31(2):313-329 [M. Carrano/H. Street/H. Street] |