near Downs (USNM): Middle Turonian, Kansas

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Plesiosauria - Polycotylidae
Trinacromerum bentonianum n. gen., n. sp. Cragin 1888
2 individuals
USNM 10945 (holotype) and 10946 (paratype, form an 'adjacent locality')
see common names

Geography
Country:United States State/province:Kansas County:Mitchell County
Coordinates: 39.4° North, 98.5° West (view map)
Paleocoordinates:39.9° North, 63.5° West
Basis of coordinate:stated in text
Geographic resolution:small collection
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Turonian 10 m.y. bin:Cretaceous 6
Key time interval:Middle Turonian
Age range of interval:93.50000 - 89.30000 m.y. ago
Stratigraphy
Geological group:Colorado Formation:Carlile Shale Member:Fairport
Stratigraphic resolution:bed
Stratigraphy comments: "The geologic map of Landes (1930) shows that the only geologic unit exposed in this vicinity is the Fairport Chalk. This matches well with Cragin's (1888) description of the geology, as a few feet below the base of the dark septaria-bearing shale (Blue Hill) is equivalent to within the Fairport Chalk Member of the Carlisle Shale. The age of this specimen is early Middle Turonian" (Schumacher & Everhart 2005, p. 40).
Lithology and environment
Primary lithology: "limestone"
Environment:marine indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Temporal resolution:snapshot
Collection methods and comments
Collection methods:selective quarrying
Reason for describing collection:taxonomic analysis
Museum repositories:UNSM
Metadata
Also known as:Trinacromerum bentonianum type
Database number:117805
Authorizer:R. Benson Enterer:R. Benson
Modifier:M. Carrano Research group:vertebrate
Created:2011-09-27 00:24:43 Last modified:2012-01-31 16:24:28
Access level:the public Released:2011-09-27 00:24:43
Creative Commons license:CC BY
Reference information

Primary reference:

37870. B. A. Schumacher and M. J. Everhart. 2005. A stratigraphic and taxonomic review of plesiosaurs from the old "Fort Benton Group" of central Kansas: a new assessment of old records. Paludicola 5(2):33-54 [R. Benson/R. Benson/R. Butler]

Secondary references:

34117 K. Carpenter. 1996. A review of short-necked plesiosaurs of the Western Interior, North America. Neues Jahrbuch fur Geologie und Palaontologie, Abhandlungen 201(2):259-287 [M. Carrano/H. Street]