Ried Coulee 1: Lancian, Montana

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Osteichthyes
Osteichthyes indet. Huxley 1880
Database 2005 7 elements
Mammalia - Stagodontidae
Didelphodon vorax Marsh 1889
Mammalia - Multituberculata - Neoplagiaulacidae
Mesodma thompsoni Clemens 1964
(1 measurement)
Mesodma cf. formosa (Marsh 1889)
Reptilia
Reptilia indet. Laurenti 1768
Database 2005 1 specimen
Reptilia - Testudines
Testudines indet. Batsch 1788
Database 2005 4 specimens
Cryptodira indet. Cope 1868
Database 2005 1 specimen
Reptilia - Testudines - Trionychidae
Trionychidae indet. Gray 1825
Database 2005 3 specimens
Reptilia - Testudines - Kinosternoidea
Kinosternoidea indet. Hay 1892
Database 2005 1 specimen
Reptilia - Testudines - Chelydridae
Chelydridae indet. Swainson 1839
Database 2005 2 specimens
Reptilia - Squamata
Squamata indet. Oppel 1811
Database 2005 1 specimen
Reptilia
Champsosaurus natator Parks 1933
Database 2005 1 specimen
Reptilia - Champsosauridae
Champsosauridae indet. Cope 1876
Database 2005 2 specimens
Reptilia - Theropoda
Megalosauridae indet. (Fitzinger 1843)
Database 2005 1 specimen
    = Theropoda indet. Marsh 1881
Carrano 2025
Theropoda indet. Marsh 1881
Database 2005 1 specimen
Reptilia - Dromaeosauridae
Dromaeosauridae indet. Colbert and Russell 1969
Database 2005 4 specimens
Saurornitholestinae indet. Longrich and Currie 2009
Larson and Currie 2013 1 specimen
UCMP 186962
Reptilia - Ceratopsidae
Ceratopsidae indet. Marsh 1888
Database 2005 3 specimens
Triceratops sp. Marsh 1889
Database 2005 1 specimen
Reptilia - Crocodylia
Crocodylia indet. (Owen 1842)
Database 2005 1 specimen
Reptilia
Alligatoroidea indet. Gray 1844
Database 2005 1 specimen
Brachychampsa montana Gilmore 1911
Database 2005 1 specimen
Reptilia - Crocodylidae
Crocodylidae indet. Cuvier 1807
Database 2005 1 specimen
Reptilia
Leidyosuchus sternbergi (Gilmore 1910)
Database 2005 1 specimen
recombined as Borealosuchus sternbergii
Amphibia
Amphibia indet. Linnaeus 1758
Database 2005 2 specimens
Amphibia - Temnospondyli - Urodela
Urodela indet. (Duméril 1805)
Database 2005 2 specimens
Scapherpeton tectum Cope 1876
Database 2005 2 specimens
Actinopteri - Amiiformes - Amiidae
Amiidae indet. Huxley 1861
Database 2005 2 elements
Amia uintaensis (Leidy 1873)
Database 2005 1 element
nomen dubium belonging to Amiinae
Amia fragosa Jordan 1927
Database 2005 2 elements
Actinopteri - Lepisosteiformes - Lepisosteidae
Lepisosteidae indet. Cuvier 1825
Database 2005 3 elements
Lepisosteus occidentalis (Leidy 1856)
Database 2005 3 elements
original and current combination Lepidotus occidentalis
Actinopteri - Esociformes - Esocidae
Estesesox foxi Wilson et al. 1992
Wilson et al. 1992 1 element
Chondrichthyes - Rajiformes - Rhinobatidae
Myledaphus bipartitus Cope 1876
Database 2005 4 elements
UCMP 146187, 3 teeth; UCMP 145936, 1 tooth
    = Myledaphus pustulosus Cook et al. 2014
Cook et al. 2014
Chondrichthyes - Hybodontiformes - Lonchidiidae
Lonchidion selachos Estes 1964
Database 2005 2 elements
see common names

Geography
Country:United States State/province:Montana County:Garfield
Coordinates: 47.5° North, 106.9° West (view map)
Paleocoordinates:54.3° North, 80.0° West
Basis of coordinate:unpublished field data
Geographic resolution:small collection
Time
Period:Cretaceous Epoch:Late/Upper Cretaceous
Stage:Maastrichtian 10 m.y. bin:Cretaceous 8
*Epoch:Senonian
Key time interval:Lancian
Age range of interval:72.10000 - 66.00000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Geological group:Montana Formation:Hell Creek Member:Upper
Stratigraphic resolution:bed
Lithology and environment
Primary lithology: sandstone
Includes fossils?Y
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Size of fossils:mesofossils
Disassociated major elements:many
Disassociated minor elements:many
Collection methods and comments
Collection methods:surface (float),field collection
Reason for describing collection:taxonomic analysis
Museum repositories:UCMP
Metadata
Also known as:UCMP V-73090
Database number:14615
Authorizer:J. Alroy, M. Carrano Enterer:J. Alroy, M. Carrano
Modifier:M. Carrano Research group:vertebrate
Created:1994-04-30 00:00:00 Last modified:2021-09-02 10:57:36
Access level:the public Released:1994-04-30 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:
960. J. D. Archibald. 1982. A study of Mammalia and geology across the Cretaceous-Tertiary boundary in Garfield County, Montana. University of California Publications in Geological Sciences 122:1-286 [J. Alroy/J. Alroy/M. Carrano]

Secondary references:

14199ETE M. T. Carrano. 2025. Taxonomic opinions on the Dinosauria. [M. Carrano/M. Carrano/M. Carrano]
77911 T. D. Cook, M. G. Newbrey, D. B. Brinkman and J. I. Kirkland. 2014. Euselachians from the freshwater deposits of the Hell Creek Formation of Montana. In G. P. Wilson, W. A. Clemens, J. R. Horner, J. H. Hartman (eds.), Through the End of the Cretaceous in the Type Locality of the Hell Creek Formation in Montana and Adjacent Areas. Geological Society of America Special Paper 503:229-246 [M. Carrano/M. Carrano]
13103 U.C.M.P. Database. 2005. UCMP collections database. University of California Museum of Paleontology [M. Carrano/M. Carrano/M. Carrano]
48570 D. W. Larson and P. J. Currie. 2013. Multivariate analyses of small theropod dinosaur teeth and implications for paleoecological turnover through time. PLoS ONE 8(1):e54329:1-14 [M. Carrano/M. Carrano/M. Carrano]
45321 M. V. H. Wilson, D. B. Brinkman, and A. G. Neuman. 1992. Cretaceous Esocoidei (Teleostei): early radiation of the pikes in North American fresh waters. Journal of Paleontology 66(5):839-846 [M. Bell/M. Bell]