Mule Creek, 15 miles west of Edgemont: Early/Lower Campanian, Wyoming
collected by B. Brown 1904

List of taxa
Where & when
Taphonomy & methods
Metadata & references
Taxonomic list
Reptilia - Sauropterygia - Elasmosauridae
Styxosaurus browni n. sp. Welles 1952
1 individual
AMNH 5835
see common names

Country:United States State/province:Wyoming County:Niobrara
Coordinates: 43.4° North, 104.2° West (view map)
Paleocoordinates:49.5° North, 72.3° West
Basis of coordinate:based on nearby landmark
Geographic resolution:small collection
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Campanian 10 m.y. bin:Cretaceous 7
Key time interval:Early/Lower Campanian Ammonoid zone: Baculites sp. (weakly ribbed)-Baculites obtusus
Age range of interval:83.50000 - 70.60000 m.y. ago
Geological group:Montana Formation:Pierre Shale Member:Sharon Springs
Stratigraphic resolution:bed
Stratigraphy comments: Ammonite Zone range of the Sharon Springs Member in Wyoming is Baculites sp. (weakly ribbed)-Baculites obtusus, Early Campanian according to Gill et al. 1972
Lithology and environment
Primary lithology:gray "shale"
Environment:marine indet.
Modes of preservation:body
Size of fossils:macrofossils
Associated major elements:all
Collection methods and comments
Collection methods:mechanical,survey of museum collection
Reason for describing collection:taxonomic analysis
Museum repositories:AMNH
Collectors:B. Brown Collection dates:1904
Database number:77348
Authorizer:M. Carrano Enterer:M. Carrano
Modifier:P. Mannion Research group:vertebrate
Created:2008-01-09 07:53:14 Last modified:2018-06-14 10:13:04
Access level:the public Released:2008-01-09 07:53:14
Creative Commons license:CC BY
Reference information

Primary reference:

26172.ETE K. Carpenter. 1999. Revision of North American elasmosaurs from the Cretaceous of the Western Interior. Paludicola 2(2):148-173 [M. Carrano/M. Carrano]

Secondary references:

48141 J. R. Gill, W. A. Cobban, and L. G. Schultz. 1972. Stratigraphy and Composition of the Sharon Springs Member of the Pierre Shale in Western Kansas. Geological SUrvey Professional Paper 728:1-50 [R. Benson/R. Benson]
59502 R. A. Otero. 2016. Taxonomic reassessment of Hydralmosaurus as Styxosaurus: new insights on the elasmosaurid neck evolution throughout the Cretaceous. PeerJ 4:e1777:1-60 [C. Boyd/C. Boyd/P. Mannion]
38181 G. W. Storrs. 1999. An examination of Plesiosauria (Diapsida: Sauropterygia) from the Niobrara Chalk (Upper Cretaceous) of Central North America. Paleontological Contributions of the University of Kansas 11:1-15 [R. Benson/R. Benson]