USGS 13408, Washington: Late/Upper Campanian, Arkansas

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:Hempstead
Coordinates: 33.8° North, 93.7° West (view map)
Paleocoordinates:37.9° North, 65.4° West
Basis of coordinate:estimated from map
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:marine indet.
Taphonomy
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:USGS
Metadata
Database number:78199
Authorizer:W. Kiessling, M. Clapham Enterer:U. Merkel, M. Clapham
Modifier:W. Kiessling Research group:marine invertebrate
Created:2008-01-31 01:48:13 Last modified:2009-08-19 10:14:55
Access level:the public Released:2008-01-31 01:48:13
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]