Bluff on southwest side of Missouri River: Early/Lower Campanian - Middle Campanian, Nebraska
collected by E. D. Cope 1876
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Reptilia
- Plesiosauria
- Elasmosauridae
|
||||||||||
|
Hydralmosaurus serpentinus n. gen., n. sp.
(Cope 1877)
|
1 individual | |||||||||
| AMNH 1495 (holotype) | ||||||||||
|
= Styxosaurus sp.
Welles 1943
|
Otero 2016 | |||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Nebraska |
| Coordinates: | 42.7° North, 96.8° West (view map) | ||
| Paleocoordinates: | 47.1° North, 64.9° West | ||
| Basis of coordinate: | estimated from map | ||
| Geographic resolution: | small collection |
Time
| Period: | Cretaceous | Epoch: | Late/Upper Cretaceous |
| Stage: | Campanian | 10 m.y. bin: | Cretaceous 7 |
| Key time interval: | Early/Lower Campanian - Middle Campanian | ||
| Age range of interval: | 83.60000 - 72.10000 m.y. ago |
Stratigraphy
| Geological group: | Montana | Formation: | Pierre Shale | Member: | Sharon Springs |
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: Storrs (1999, p. 5) suggests Sharon Springs Shale Member, Pierre Shale (Campanian), accompanied by a discussion of Welles (1962) provenance of 'Cretaceous No. 3 (i.e. Niobrara Chalk, or Pierre Shale). and description of the matrix: "blue shale with selenite venation,quite unlike Niobrara rocks but identical to matrix associated with known Pierre specimens"
Carpenter (1999, p. 156) stated "Smoky Hill Chalk member, Niobrara Formation (Santonian?)" without justification. The Sharon Springs member in Nebraska has an ammonite zone range of Baculites sp. (smooth)–Baculites mclearni (Early-Middle Campanian) according to Gill et al. (1972). | |||||
Lithology and environment
| Primary lithology: | blue "shale" |
| Includes fossils? | Y |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Temporal resolution: | snapshot |
Collection methods and comments
| Collection methods: | surface (in situ) | ||
| Reason for describing collection: | taxonomic analysis | ||
| Museum repositories: | AMNH | ||
| Collectors: | E. D. Cope | Collection dates: | 1876 |
Metadata
| Also known as: | Hydralmosaurus serpentinus type locality | ||
| Database number: | 116621 | ||
| Authorizer: | R. Benson, P. Mannion | Enterer: | R. Benson, P. Mannion |
| Modifier: | P. Mannion | Research group: | vertebrate |
| Created: | 2011-09-10 00:01:24 | Last modified: | 2018-06-14 10:05:45 |
| Access level: | the public | Released: | 2011-09-10 00:01:24 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 17576. | ETE | E. D. Cope. 1877. Report on the geology of the region of the Judith River, Montana, and on vertebrate fossils obtained on or near the Missouri River. Bulletin of the United States Geological and Geographical Survey 3(3):565-597 [M. Carrano/M. Carrano/E. Vlachos] |
Secondary references:
| 26172 | ETE | K. Carpenter. 1999. Revision of North American elasmosaurs from the Cretaceous of the Western Interior. Paludicola 2(2):148-173 [M. Carrano/M. Carrano] |
| 48141 | J. R. Gill, W. A. Cobban, and L. G. Schultz. 1972. Stratigraphy and Composition of the Sharon Springs Member of the Pierre Shale in Western Kansas. Geological SUrvey Professional Paper 728:1-50 [R. Benson/R. Benson] | |
| 59502 | R. A. Otero. 2016. Taxonomic reassessment of Hydralmosaurus as Styxosaurus: new insights on the elasmosaurid neck evolution throughout the Cretaceous. PeerJ 4:e1777:1-60 [C. Boyd/C. Boyd/P. Mannion] | |
| 38181 | G. W. Storrs. 1999. An examination of Plesiosauria (Diapsida: Sauropterygia) from the Niobrara Chalk (Upper Cretaceous) of Central North America. Paleontological Contributions of the University of Kansas 11:1-15 [R. Benson/R. Benson] |