7 miles southeast of Castle Rock: Late/Upper Coniacian - Early/Lower Santonian, Kansas
collected by B. F. Mudge 1873

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Mosasauridae
Clidastes planifrons n. sp. Cope 1874
1 individual
recombined as Platecarpus planifrons
Holotype - AMNH 1491, incomplete cranial and postcranial elements, consisting of frontal, right pterygoid, quadrates, parietal, left postorbitofrontal, left squamosal, left splenial, left angular, left surangular, left coronoid, basisphenoid-basioccipital, fifteen anterior vertebrae including atlas-axis, and other miscellaneous bone fragments
see common names

Geography
Country:United States State/province:Kansas County:Trego
Coordinates: 38.8° North, 100.1° West (view map)
Paleocoordinates:41.6° North, 66.4° West
Basis of coordinate:based on nearby landmark
Geographic resolution:small collection
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
10 m.y. bin:Cretaceous 6
Key time interval:Late/Upper Coniacian - Early/Lower Santonian
Age range of interval:89.30000 - 83.50000 m.y. ago
Stratigraphy
Geological group:Colorado Formation:Niobrara Member:Smoky Hill Chalk
Stratigraphic resolution:bed
Stratigraphy comments: lower part of member
Lithology and environment
Primary lithology: chalk
Includes fossils?Y
Environment:marine indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Museum repositories:AMNH
Collectors:B. F. Mudge Collection dates:1873
Metadata
Also known as:Clidastes planifrons type
Database number:123571
Authorizer:P. Mannion Enterer:P. Mannion
Modifier:M. Carrano Research group:vertebrate
Created:2012-01-26 01:30:00 Last modified:2017-10-19 13:05:41
Access level:the public Released:2012-01-26 01:30:00
Creative Commons license:CC BY
Reference information

Primary reference:

63646. E. D. Cope. 1874. Review of the Vertebrata of the Cretaceous Period found west of the Mississippi River. Bulletin of the United States Geological and Geographical Survey of the Territories, First Series 2:3-48 [M. Carrano/M. Carrano/M. Carrano]

Secondary references:

33389 T. Konishi and M. W. Caldwell. 2007. New specimens of Platecarpus planifrons (Cope, 1874) (Squamata: Mosasauridae) and a revised taxonomy of the genus. Journal of Vertebrate Paleontology 27(1):59-72 [M. Carrano/H. Street/P. Mannion]