3 miles (5 km) northeast of Freeland Junction: Spathian, Wyoming
collected by FIeld Museum 1948
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Reptilia
- Eosauropterygia
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Corosaurus alcovensis
Case 1936
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1 specimen | |||||||||
| First reported by Zangerl (1963) | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Wyoming | County: | Natrona County |
| Coordinates: | 42.7° North, 106.4° West (view map) | ||||
| Paleocoordinates: | 10.3° North, 31.8° West | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | small collection |
Time
| Period: | Triassic | Epoch: | Early/Lower Triassic |
| Stage: | Olenekian | 10 m.y. bin: | Triassic 1 |
| Key time interval: | Spathian | ||
| Age range of interval: | 248.90000 - 247.20000 m.y. ago |
Stratigraphy
| Geological group: | Chugwater | Formation: | Crow Mountain | Member: | Alcova Limestone |
| Stratigraphy comments: Alcova (Limestone) Member, Crow Mountain Formation, Chugwater Group
The stratigraphic correlation and hence determination of the relative geological age of the Alcova Limestone is rendered difficult by the general paucity of fossils, vertebrates (Corosaurus) and invertebrates alike (for a review see Storrs, 1991). The presence of the nothosauriform reptile Corosaurus has led some workers (Colbert, 1957; Zangerl, 1963) to assign the Alcova to the Upper Triassic. Storrs (1 99 1 : 10 1) accepted a late Lower Triassic (Scythian, Spathian) or, perhaps, an early Middle Triassic (Anisian) age for the Alcova Limestone | |||||
Lithology and environment
| Primary lithology: | dolomitic,stromatolitic,shelly/skeletal,gray lithified silty,carbonaceous "limestone" |
| Includes fossils? | Y |
| Environment: | shallow subtidal indet. |
Taphonomy
| Modes of preservation: | body |
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | surface (in situ),field collection | ||
| Reason for describing collection: | taxonomic analysis | ||
| Museum repositories: | FMNH | ||
| Collectors: | FIeld Museum | Collection dates: | 1948 |
Metadata
| Database number: | 138080 | ||
| Authorizer: | R. Benson | Enterer: | R. Benson |
| Modifier: | R. Benson | Research group: | vertebrate |
| Created: | 2013-01-04 20:32:57 | Last modified: | 2013-05-14 08:36:57 |
| Access level: | the public | Released: | 2013-01-04 20:32:57 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 28997. | O. Rieppel. 1998. Corosaurus alcovensis Case and the phylogenetic interrelationships of Triassic stem-group Sauropterygia. Zoological Journal of the Linnean Society 124:1-41 [S. Peters/D. Lovelace] |
Secondary references:
| 46813 | G. W. Storrs. 1991. Anatomy and relationships of Corosaurus alcovensis (Diapsida: Sauropterygia) and the Triassic Alcova Limestone of Wyoming. Bulletin of the Peabody Museum of Natural History 44:1-151 [R. Benson/R. Benson] |