Johnson Ranch, Redbird: Early/Lower Campanian - Middle Campanian, Wyoming
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Reptilia
- Plesiosauria
- Polycotylidae
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Trinacromerum bonneri n. sp.
Adams 1997
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1 individual | |||||||||
| KUMNH 40002 (holotype, complete skeleton minus skull) | ||||||||||
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= Martinectes bonneri n. gen., n. sp.
Adams 1997
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Clark et al. 2024 | |||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Wyoming | County: | Niobrara |
| Coordinates: | 43.4° North, 104.2° West (view map) | ||||
| Paleocoordinates: | 49.5° North, 72.2° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| 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 | Ammonoid zone: | Baculites maclearni and Baculites obtusus |
| 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: 10 ft above Ardmore Bentonite
In fact the Sharon Springs Member spans the Baculites mclearni and Baculites obtusus Zones in Wyoming (Gill et al. 1972) | |||||
Lithology and environment
| Primary lithology: | not reported |
| Environment: | marine indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | good |
| Articulated whole bodies: | all |
| Fragmentation: | occasional |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
Metadata
| Also known as: | T. bonneri type | ||
| Database number: | 77312 | ||
| Authorizer: | M. Carrano, E. Vlachos | Enterer: | M. Carrano, F. Aspromonte |
| Modifier: | P. Wagner | Research group: | vertebrate |
| Created: | 2008-01-08 15:00:17 | Last modified: | 2021-02-12 18:16:22 |
| Access level: | the public | Released: | 2008-01-08 15:00:17 |
| Creative Commons license: | CC BY | ||
Reference information
Primary reference:
| 26171. | ETE | D. A. Adams. 1997. Trinacromerum bonneri, new species, last and fastest pliosaur of the Western Interior Seaway. Texas Journal of Science 49(3):179-198 [M. Carrano/M. Carrano] |
Secondary references:
| 87231 | R. O. Clark, F. R. O'Keefe, and S. E. Slack. 2024. A new genus of small polycotylid plesiosaur from the Upper Cretaceous of the Western Interior Seaway and a clarification of the genus Dolichorhynchops. Cretaceous Research 157:105812:1-35 [E. Vlachos/F. Aspromonte/P. Mannion] | |
| 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] |