COLORADO
NW BACA COUNTY
UNNAMED CREEK
LOWER CENOMANIAN STAGE
UPPER MIDDLE GALLIC SUBEPOCH
LOWERMOST GULF EPOCH
MIDDLE CRETACEOUS
NOTE: WAS LOWEST FORMATION IN THE BENTON GROUP, EARLY LATE CRETACEOUS
STEM: TETRAPODA GOODRICH, 1930
SUPERCLASS: AMNIOTA HAECKEL, 1866
CLASS: REPTILIA LAURENTI, 1768
SUBCLASS: DIAPSIDA OSBORN, 1904
INFRACLASS: EURYAPSIDA COLBERT, 1945
SUPERORDER: SAUROPTERYGIA OWEN 1860
GRANDORDER: EOSAUROPTERYGIA emend RIEPPEL, 1994
ORDER: PLESIOSAURIA OWEN, 1840 NON BLAINVILLE, 1835
SUBORDER: PLESIOSAURIA OWEN, 1840 NON BLAINVILLE, 1835
INFRAORDER: PLESIOSAUROMORPHA NOVA
EUPLESIOSAURIA O’KEEFE, 2001
Superfamily: ELASMOSAUROIDEA Cope, 1869
Family: ELASMOSAURIDAE Cope, 1869
*Thalassomeodon haningtoni
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SOUTHEASTERN COLORADO
BACA COUNTY
PICTURE CANYON
DAKOTA GROUP
CENOMANIAN STAGE
UPPER GALLIC SUBEPOCH
LOWERMOST GULF EPOCH
MIDDLE CRETACEOUS
ICHNOSTEM: TETRAPODIPIDA NOVA
ICHNOSUPERCLASS: AMNIOTAIPIDII NOVA
INCHNOCLASS: AVIPEDIA VIALOV, 1966
Incertae sedis
Magnoavipes caneeri
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SOUTHEASTERN COLORADO
BACA COUNTY
COMANCHE NATIONAL GRASSLAND
LINCOLN LIMESTONE MEMBER
GREENHORN LIMESTONE
MIDDLE CENOMANIAN STAGE
UPPER GALLIC SUBEPOCH
LOWER GULF EPOCH
MIDDLE CRETACEOUS
STEM: TETRAPODA GOODRICH, 1930
SUPERCLASS: AMNIOTA HAECKEL, 1866
CLASS: REPTILIA LAURENTI, 1768
SUBCLASS: DIAPSIDA OSBORN, 1904
INFRACLASS: EURYAPSIDA COLBERT, 1945
SUPERORDER: SAUROPTERYGIA OWEN 1860
PARVORDER: EOSAUROPTERYGIA emend RIEPPEL, 1994
ORDER: PLESIOSAURIA OWEN, 1840 NON BLAINVILLE, 1835
INCERTAE SEDIS
Gen. sp indet.
SUBORDER: PLESIOSAURIA OWEN, 1840 NON BLAINVILLE, 1835
INFRAORDER: PLESIOSAUROMORPHA NOVA
EUPLESIOSAURIA O’KEEFE, 2001
Superfamily: CRYPTOCLEIDOIDEA Williston, 1925
TRICLEDIA O’KEEFE , 2001
Family: POLYCOTYLIDAE Cope, 1869
Cf. Trinacromerium sp
INCERTAE SEDIS
Gen. sp indet.
INFRAORDER: PLIOSAUROMORPHA NOVA
Superfamily: PLIOSAUROIDEA Seeley, 1874
Family: BRACHAUCHNEIIDAE Williston, 1925
Cf. Brachauchenius sp
INFRACLASS: NEODIAPSIDA BENTON, 1985
LEGION: LEPIDOSAUROMORPHA BENTON, 1983
SUBLEGION: LEPIDOSAURIA HAECKEL, 1866 (DUMERIL & BIBRON, 1839)
MAGNORDER: SQUAMATA, OPPEL, 1811
INCERTAE SEDIS
Gen. sp indet.
SUPERORDER: LACERTILIA OWEN, 1842
GRANDORDER: SCINCOGEKKONOMORPHA SUKHANOV, 1961
MICRORDER: SCINCOMORPHA CAMP, 1923
ORDER: ANGUIMORPHA FURBRINGER, 1900
SUBORDER: DIPLOGLOSSA COPE, 1864
INFRAORDER: THECAGLOSSA COPE, 1890
PARVORDER: MONSTERSAURIA NORELL & GAO, 1977
Superfamily: VARANOIDEA Gray, 1827 (sensu Camp, 1923)
Family: MOSASAURIDAE Gervais, 1853
INCERTAE SEDIS
Gen. sp indet.
Subfamily: DOLICHOSAURIDAE Gervais, 1852
Tribe: DOLICHOSAURINI Gervais, 1852
Coniasaurus cf C. crassidens
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SOUTHWESTERN COLORADO
BACA COUNTY
COMANCHE NATIONAL GRASSLANDS
MESA RICA SANDSTONE
DAKOTA GROUP
CENOMANIAN STAGE
UPPERMIDDLE GALLIC SUBEPOCH
LOWERMOST GULF EPOCH
LATE EARLY CRETACEOUS
ICHNOSTEM: TETRAPODIPIDA NOVA
ICHNOSUPERCLASS: AMNIOTAIPIDII NOVA
INCHNOCLASS: AVIPEDIA VIALOV, 1966
Incertae sedis
Magnoavipes sp
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