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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