USGS 13406, SW of Arkadelphia: Late/Upper Campanian, Arkansas
collected by L.W. Stephenson, C.H. Dane
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Echinoidea
- Spatangoida
- Micrasteridae
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Micraster americanus
(Stephenson 1941)
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Echinoidea
- Spatangoida
- Hemiasteridae
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Hemiaster wetherbyi
de Loriol 1887
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see common names |
Geography
Country: | United States | State/province: | Arkansas | County: | Clark |
Coordinates: | 34.0° North, 93.1° West (view map) | ||||
Paleocoordinates: | 38.0° North, 64.8° 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: | Late/Upper Campanian | Ammonoid zone: | Nostoceras hyatti |
Age range of interval: | 83.60000 - 72.10000 m.y. ago |
Stratigraphy
Formation: | Saratoga Chalk | ||||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: Was early Maastrichtian, updated by Kennedy and Cobban to late Campanian |
Lithology and environment
Primary lithology: | chalk |
Environment: | carbonate indet. |
Taphonomy
Modes of preservation: | body |
Size of fossils: | macrofossils |
Preservation of anatomical detail: | good |
Collection methods and comments
Collection methods: | survey of museum collection |
Reason for describing collection: | taxonomic analysis |
Museum repositories: | USNM |
Collectors: | L.W. Stephenson, C.H. Dane |
Metadata
Database number: | 197648 | ||
Authorizer: | M. Clapham | Enterer: | M. Clapham | Research group: | marine invertebrate |
Created: | 2018-11-19 22:12:11 | Last modified: | 2018-11-19 22:12:11 |
Access level: | the public | Released: | 2018-11-19 22:12:11 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
26335. | 1% 20600 | C. W. Cooke. 1953. American Upper Cretaceous Echinoidea. United States Geological Survey Professional Paper 254-A:1-44 [W. Kiessling/U. Merkel/M. Clapham] |