Lead Slug Hill 1: Lancian, Montana

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Osteichthyes
Osteichthyes indet. Huxley 1880
Database 2005 5 elements
Actinopteri - Esociformes - Esocidae
Estesesox foxi Wilson et al. 1992
Yeh 1990 1 element
Actinopteri - Lepisosteiformes - Lepisosteidae
Lepisosteus sp. Agassiz 1843
Database 2005 2 elements
Lepisosteus occidentalis (Leidy 1856)
Database 2005 5 elements
original and current combination Lepidotus occidentalis
Actinopteri - Amiiformes - Amiidae
Amia sp. Linnaeus 1766
Database 2005 1 element
Amia uintaensis (Leidy 1873)
Database 2005 1 element
nomen dubium belonging to Amiinae
Amia fragosa Jordan 1927
Database 2005 4 elements
Reptilia
Reptilia indet. Laurenti 1768
Database 2005 2 specimens
Reptilia - Sauria
Sauria indet. MacCartney 1802
Database 2005 1 specimen
Reptilia
Champsosaurus sp. Cope 1876
Database 2005 1 specimen
Champsosaurus natator Parks 1933
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 9 specimens
Reptilia
Paronychodon lacustris Cope 1876
Database 2005 2 specimens
nomen dubium belonging to Paronychodon
Reptilia - Dromaeosauridae
? Dromaeosauridae indet. Colbert and Russell 1969
Database 2005 1 specimen
Richardoestesia cf. gilmorei Currie et al. 1990
Larson and Currie 2013 1 specimen
UCMP 119921
Saurornitholestinae indet. Longrich and Currie 2009
Larson and Currie 2013 4 specimens
UCMP 187042–5
Reptilia - Troodontidae
Troodontidae indet. Gilmore 1924
Database 2005 1 specimen
Troodon sp. Leidy 1856
Sankey 2008 1 specimen
UCMP 187057
Reptilia
Aves indet. Linnaeus 1758
Database 2005 1 specimen
Reptilia - Caenagnathidae
Chirostenotes sp. Gilmore 1924
Database 2005 2 specimens
Reptilia - Tyrannosauridae
Tyrannosauridae indet. Osborn 1906
Database 2005 1 specimen
Reptilia - Coeluridae
Coeluridae indet. Marsh 1881
Database 2005 2 specimens
Reptilia - Nodosauridae
Edmontonia sp. Sternberg 1928
Database 2005 1 specimen
Reptilia - Ceratopsidae
Ceratopsidae indet. Marsh 1888
Database 2005 2 specimens
Reptilia - Hadrosauridae
Hadrosauridae indet. Cope 1869
Database 2005 3 specimens
Reptilia
Thescelosaurus sp. Gilmore 1913
Database 2005 1 specimen
Leidyosuchus sternbergi (Gilmore 1910)
Database 2005 1 specimen
recombined as Borealosuchus sternbergii
Reptilia - Crocodylidae
Crocodylidae indet. Cuvier 1807
Database 2005 4 specimens
Reptilia
Brachychampsa montana Gilmore 1911
Database 2005 2 specimens
Parasaniwa wyomingensis Gilmore 1928
Database 2005 1 specimen
Reptilia - Baenidae
Palatobaena bairdi Gaffney 1972
Database 2005 1 specimen
Reptilia - Testudines
Cryptodira indet. Cope 1868
Database 2005 3 specimens
Reptilia - Testudines - Trionychidae
Trionychidae indet. Gray 1825
Database 2005 2 specimens
Reptilia - Testudines - Chelydridae
? Chelydridae indet. Swainson 1839
Database 2005 2 specimens
Reptilia - Testudines
Clemmys backmani Russell 1934
Database 2005 1 specimen
recombined as Osteopygis backmani
Mammalia - Multituberculata - Cimolodontidae
Cimolodon nitidus Marsh 1889
Mammalia - Multituberculata - Neoplagiaulacidae
? Neoplagiaulacidae indet. Ameghino 1890
Mammalia - Multituberculata - Cimolomyidae
Cimolomys gracilis Marsh 1889
Mammalia - Stagodontidae
Didelphodon vorax Marsh 1889
Mammalia - Alphadontidae
Alphadon rhaister Clemens 1966
    = Turgidodon rhaister Clemens 1966
Alroy 2002
Alphadon marshi Simpson 1927
    = Alphadon sp. Simpson 1927
Alroy 2002
possibly A. jasoni in light of Johanson 1996b
Mammalia - Pediomyidae
Pediomys hatcheri (Osborn 1898)
original and current combination Protolambda hatcheri
Amphibia - Temnospondyli - Urodela
Urodela indet. (Duméril 1805)
Database 2005 2 specimens
Scapherpeton tectum Cope 1876
Database 2005 3 specimens
Amphibia - Temnospondyli - Batrachosauroididae
Opisthotriton kayi Auffenberg 1961
Database 2005 1 specimen
Acipenseriformes - Acipenseridae
Acipenser eruciferus (Cope 1876)
Database 2005 2 elements
Chondrichthyes
? Elasmobranchii indet. Bonaparte 1838
Database 2005 1 element
Chondrichthyes - Rajiformes - Rhinobatidae
Myledaphus bipartitus Cope 1876
Database 2005 11 elements
UCMP 128686, 2 teeth; UCMP 119874, 2 teeth; UCMP 119875, five complete and partial teeth; UCMP 119876, one partial tooth and one denticle
    = Myledaphus pustulosus Cook et al. 2014
Cook et al. 2014
Chondrichthyes - Orectolobiformes - Orectolobidae
Squatirhina americana Estes 1964
Database 2005 1 element
recombined as Restesia americana
Chondrichthyes - Hybodontiformes - Lonchidiidae
Lonchidion selachos Estes 1964
Database 2005 1 element
see common names

Geography
Country:United States State/province:Montana County:Garfield
Coordinates: 47.1° North, 106.9° West (view map)
Paleocoordinates:53.8° North, 80.2° 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: silty sandstone
Includes fossils?Y
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Lagerst�tten type:concentrate
Degree of concentration:concentrated
Size of fossils:mesofossils
Disassociated major elements:many
Disassociated minor elements:many
Collection methods and comments
Collection methods:bulk,surface (float),sieve,field collection
Reason for describing collection:taxonomic analysis
Museum repositories:UCMP
Metadata
Also known as:UCMP V-72208
Database number:14582
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 11:03:19
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:

6294 J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari]
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]
34479ETE J. T. Sankey. 2008. Diversity of latest Cretaceous (late Maastrichtian) small theropods and birds: teeth from the Lance and Hell Creek formations, USA. In J. T. Sankey & S. Baszio (ed.), Vertebrate Microfossil Assemblages: Their Role in Paleoecology and Paleobiogeography. Indiana University Press, Bloomington 117-134 [M. Carrano/M. Carrano]
14582 K.-Y. Yeh. 1990. Taxonomic studies of Triassic radiolaria from Busuanga Island, Philippines. Bulletin of National Museum of Natural Science, Taichung, Taiwan (2)155-63 [W. Kiessling/M. Riess/M. Riess]