Long Lake: Late/Upper Maastrichtian, North Dakota
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Reptilia
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Emys obscurus n. sp.
Leidy 1856
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Hay 1908 | 1 specimen | ||||||||
| nomen dubium belonging to Compsemys | ||||||||||
| Lost type found by Dr. F. V. Hayden at Long Lake | ||||||||||
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Compsemys victa n. gen., n. sp.
(Leidy 1856)
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1 specimen | |||||||||
| USNM 960 | ||||||||||
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Reptilia
- Testudines
- Trionychidae
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Aspideretes foveatus
(Leidy 1856)
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Hay 1908 | 1 specimen | ||||||||
| original and current combination Trionyx foveatus | ||||||||||
| USNM 990, a fragment of the right last costal plate found 'near Long Lake' by Dr. F. V. Hayden | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | North Dakota |
| Coordinates: | 46.7° North, 100.3° West (view map) | ||
| Paleocoordinates: | 52.2° North, 73.2° West | ||
| Basis of coordinate: | based on nearby landmark | ||
| Geographic resolution: | small collection |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Stage: | Maastrichtian | 10 m.y. bin: | Cretaceous 8 |
| Key time interval: | Late/Upper Maastrichtian | ||
| Age range of interval: | 72.10000 - 66.00000 m.y. ago |
Stratigraphy
| Geological group: | Montana | Formation: | Hell Creek | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Probable Laramie age (Hay, 1908, p. 233). As noted by Gaffney (1972) this horizon is most likely late Cretaceous. The shallow water marine Fox Hills Formation and the overlying Hell Creek Formation are exposed around Long Lake (Bluemle, 1977). Given that there are only a few vertebrate fossils known from the Fox Fills Formation and that the holotype is preserved much like fossils from the Hell Creek Formation, we are confident in constraining the provenance of this fossil to the Hell Creek Formation. | |||||
Lithology and environment
| Primary lithology: | not reported |
| Includes fossils? | Y |
| Environment: | terrestrial indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Reason for describing collection: | taxonomic analysis |
| Museum repositories: | USNM |
Metadata
| Also known as: | Compsemys victa type | ||
| Database number: | 127733 | ||
| Authorizer: | R. Benson | Enterer: | R. Benson |
| Modifier: | M. Carrano | Research group: | vertebrate |
| Created: | 2012-05-22 20:19:32 | Last modified: | 2021-05-05 11:12:18 |
| Access level: | the public | Released: | 2012-05-22 20:19:32 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 41721. | T. R. Lyson and W. G. Joyce. 2011. Cranial anatomy and phylogenetic placement of the enigmatic turtle Compsemys victa Leidy, 1856. Journal of Paleontology 85(4):789-801 [R. Benson/R. Benson] |
Secondary references:
| 14442 | ETE | O. P. Hay. 1908. The fossil turtles of North America. Carnegie Institution of Washington Publication 75:1-568 [M. Carrano/M. Carrano/M. Carrano] |