USGS 13537, 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 - Hemiasteridae
Hemiaster wetherbyi de Loriol 1887
Echinoidea - Spatangoida - Micrasteridae
Micraster americanus (Stephenson 1941)
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:197647
Authorizer:M. Clapham Enterer:M. Clapham
Modifier:M. Clapham Research group:marine invertebrate
Created:2018-11-19 22:05:44 Last modified:2018-11-19 22:11:33
Access level:the public Released:2018-11-19 22:05:44
Creative Commons license:CC BY
Reference information

Primary reference:
26335.1% 20600C. W. Cooke. 1953. American Upper Cretaceous Echinoidea. United States Geological Survey Professional Paper 254-A:1-44 [W. Kiessling/U. Merkel/M. Clapham]