Greasewood Creek: Lancian, Wyoming

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Amphibia - Temnospondyli - Urodela
Habrosaurus dilatus Gilmore 1928
Scapherpeton tectum Cope 1876
Amphibia - Temnospondyli - Batrachosauroididae
Opisthotriton kayi Auffenberg 1961
Reptilia - Ceratopsidae
cf. Triceratops sp. Marsh 1889
Reptilia
cf. Thescelosaurus sp. Gilmore 1913
Reptilia - Hadrosauridae
cf. Edmontosaurus sp. Lambe 1917
Reptilia
Paronychodon lacustris Cope 1876
nomen dubium belonging to Paronychodon
Reptilia - Tyrannosauridae
cf. Albertosaurus sp. Osborn 1905
Reptilia
Brachychampsa montana Gilmore 1911
Reptilia - Crocodylidae
Crocodylidae indet. Cuvier 1807
Reptilia
Leidyosuchus sternbergi (Gilmore 1910)
recombined as Borealosuchus sternbergii
Champsosaurus sp. Cope 1876
Reptilia - Testudines
cf. Helopanoplia distincta Hay 1908
Reptilia - Testudines - Trionychidae
Trionychidae indet. Gray 1825
Reptilia
Compsemys victa (Leidy 1856)
Reptilia - Baenidae
cf. Baenidae indet. Cope 1882
Mammalia - Pediomyidae
Pediomys cf. krejcii Clemens 1966
recombined as Leptalestes krejcii
(1 measurement)
Acipenseriformes - Acipenseridae
Acipenser eruciferus (Cope 1876)
Actinopteri - Aspidorhynchiformes - Aspidorhynchidae
Belonostomus longirostris (Lambe 1902)
Actinopteri - Amiiformes - Amiidae
Amia fragosa Jordan 1927
Actinopteri - Lepisosteiformes - Lepisosteidae
Atractosteus occidentalis (Leidy 1856)
original and current combination Lepidotus occidentalis
Chondrichthyes - Rajiformes - Rhinobatidae
Myledaphus bipartitus Cope 1876
see common names

Geography
Country:United States State/province:Wyoming County:Niobrara
Coordinates: 43.3° North, 104.4° West (view map)
Paleocoordinates:49.7° North, 79.2° West
Basis of coordinate:based on nearby landmark
Geographic resolution:outcrop
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Maastrichtian 10 m.y. bin:Cretaceous 8
*Period:Late/Upper Cretaceous *Epoch:Late/Upper Senonian
*Local age/stage:Lancian
Key time interval:Lancian
Age range of interval:72.10000 - 66.00000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Lance
Stratigraphic resolution:member
Lithology and environment
Primary lithology:"cross stratification",gray poorly lithified sandstone
Lithology description: "yellowish-gray, well sorted and rounded, medium to coarse-grained quartz sandstone... usually friable"
Environment:fluvial indet.
Geology comments: "relatively high-energy aqueous environment... cross-bedding and scour features, suggest a fluvial origin"
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils,mesofossils
Disassociated minor elements:many
Collection methods and comments
Collection methods:surface (float)
Reason for describing collection:taxonomic analysis
Museum repositories:SDSM
Collection method comments: "surface prospecting" of a blowout
Metadata
Also known as:SDSM V-685
Database number:14557
Authorizer:J. Alroy Enterer:J. Alroy
Modifier:J. Alroy Research group:vertebrate
Created:2002-05-15 00:00:00 Last modified:2002-12-06 18:59:53
Access level:the public Released:2002-05-15 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:
774. J. L. Whitmore and J. E. Martin. 1986. Vertebrate fossils from the Greasewood Creek locality in the Late Cretaceous Lance Formation of Niobrara County, Wyoming. Proceedings of the South Dakota Academy of Sciences 65:33-50 [J. Alroy/M. Sommers]