1963-1966 Clayball Hill: Late Campanian, Montana
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Mammalia
- Multituberculata
- Cimolomyidae
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Cimolomys clarki n. sp.
Sahni 1972
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Reptilia
- Teiidae
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Chamops segnis
Marsh 1892
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1 specimen | |||||||||
| AMNH 8486 | ||||||||||
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= Teiidae indet.
Gray 1827
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Gao and Fox 1996 | |||||||||
| 'if the boat-shaped configuration of AMNH 8486 can be regarded broadly as a significant similarity to Chamops, the specimen can be identified in no further detail than "Chamops sp."' | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Montana | County: | Chouteau |
| Coordinates: | 47.8° North, 109.6° West (view map) | ||||
| Paleocoordinates: | 54.9° North, 75.7° West | ||||
| Basis of coordinate: | based on political unit | ||||
| Altitude: | 975 meters | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Cretaceous | Epoch: | Late Cretaceous |
| Stage: | Campanian | 10 m.y. bin: | Cretaceous 7 | *Epoch: | Senonian |
| Key time interval: | Late Campanian | ||
| Age range of interval: | 83.6 - 72.1 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Geological group: | Montana | Formation: | Judith River | Member: | Coal Ridge |
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: 40 feet below top of formation, 100 feet below basal Bearpaw Shale oyster bed; Judithian based on fauna; prob. Coal Ridge Mbr. | |||||
Lithology and environment
| Primary lithology: | gray,yellow siltstone |
| Includes fossils? | Y |
| Lithology description: "buff to gray, fairly homogeneous siltstone" | |
| Environment: | terrestrial indet. |
Taphonomy
| Modes of preservation: | body |
| Lagerst�tten type: | concentrate |
| Degree of concentration: | concentrated |
| Size of fossils: | mesofossils |
| Spatial orientation: | random |
| Preservation of anatomical detail: | good |
| Disassociated major elements: | many |
| Disassociated minor elements: | many |
| Fragmentation: | occasional |
| Temporal resolution: | time-averaged |
| Spatial resolution: | parautochthonous |
Collection methods and comments
| Collection methods: | bulk,sieve,field collection |
| Reason for describing collection: | general faunal/floral analysis |
| Museum repositories: | AMNH |
| Taxonomic list comments:"less than 1 per cent of the mammal fossils obtained from the Judith River Formation" | |
Metadata
| Database number: | 14447 | ||
| Authorizer: | J. Alroy, R. Benson, M. Carrano | Enterer: | J. Alroy, R. Benson, M. Carrano |
| Modifier: | M. Carrano | Research group: | vertebrate |
| Created: | 2002-05-15 00:00:00 | Last modified: | 2016-05-18 15:55:45 |
| Access level: | the public | Released: | 2002-05-15 00:00:00 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 3008. | A. Sahni. 1972. The vertebrate fauna of the Judith River Formation, Montana. Bulletin of the American Museum of Natural History 147(6):321-412 [J. Alroy/J. Alroy/M. Carrano] |
Secondary references:
| 37933 | K. -Q. Gao and R. C. Fox. 1996. Taxonomy and evolution of Late Cretaceous lizards (Reptilia: Squamata) from western Canada. Bulletin of the Carnegie Museum of natural History 33:1-107 [R. Benson/R. Benson] |