Merindahl Dam: Coniacian - Santonian, South Dakota
collected by R. Martin 1957

List of taxa
Where & when
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Squamata - Mosasauridae
Clidastes tortor (Cope 1871)
1 specimen
synonym of Clidastes propython
see common names

Country:United States State/province:South Dakota County:Yankton
Coordinates: 43.0° North, 97.3° West (view map)
Paleocoordinates:44.6° North, 61.7° West
Basis of coordinate:stated in text
Geographic resolution:small collection
Period:Cretaceous Epoch:Late/Upper Cretaceous
10 m.y. bin:Cretaceous 6
Key time interval:Coniacian - Santonian
Age range of interval:89.80000 - 83.60000 m.y. ago
Geological group:Colorado Formation:Niobrara Member:Smoky Hill Chalk
Stratigraphic resolution:bed
Stratigraphy comments: "approximately 15 feet below the contact of the Niobrara and the basal beds of the overlying Pierre formation."
Lithology and environment
Primary lithology: calcareous chalk
Includes fossils?Y
Environment:carbonate indet.
Modes of preservation:body
Size of fossils:macrofossils
Preservation of anatomical detail:medium
Abundance in sediment:rare
Spatial resolution:parautochthonous
Collection methods and comments
Collection methods:field collection
Collection size:1 specimens
Reason for describing collection:general faunal/floral analysis
Collectors:R. Martin Collection dates:March 3, 1957
Collection method comments: Found both in talus and in situ
Database number:107782
Authorizer:M. Carrano Enterer:H. Street
Modifier:J. Alroy Research group:vertebrate
Created:2011-04-15 07:14:13 Last modified:2012-10-27 22:51:15
Access level:the public Released:2011-04-15 07:14:13
Creative Commons license:CC BY
Reference information

Primary reference:

35843.ETE W. Sevon. 1957. A Niobrara mosasaur from South Dakota. Proceedings of the South Dakota Academy of Science 36:144-146 [M. Carrano/H. Street]