BREWSTER COUNTY
BIG BEND REGION
NEAR TERLINGUA
SAN VICENTE MEMBER
BOQUILLAS FORMATION
UPPER CONIACIAN STAGE
LOWERMOST SENONIAN SUBEPOCH
GULF EPOCH
LATE CRETACEOUS
STEM: TETRAPODA GOODRICH, 1930
SUPERCLASS: AMNIOTA HAECKEL, 1866
CLASS: REPTILIA LAURENTI, 1768
SUBCLASS: DIAPSIDA OSBORN, 1903
INFRACLASS: NEODIAPSIDA BENTON, 1985
LEGION: LEPIDOSAUROMORPHA BENTON, 1983
SUBLEGION: LEPIDOSAURIA HAECKEL, 1866 (DUMERIL & BIBRON, 1839)
MAGNORDER: SQUAMATA, OPPEL, 1811
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
Infrafamily: NATANIA
Subfamily: PLATECARPINAE Williston, 1897
Tribe: PLIOPLATECARPINI Dollo, 1884 (sensu Russell, 1967)
Ectenosaurus
Plesioplatecarpus planifrons
= Platecarpus af planifronsSubfamily: TYLOSAURINAE Williston, 1897
Tylosaurus nepaeolicus
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TEXAS
BREWSTER COUNTY
WESTERN PART OF THE BIG BEND REGION
LOWER PEN FORMATION
UPPER CONIACIAN STAGE
LOWER MOST SENONIAN SUBEPOCH-SANTONIAN STAGE
LOWER SENONIAN SUBEPOCH
LOWER GULF EPOCH
EARLY LATE CRETACEOUS
STEM: TETRAPODA GOODRICH, 1930
SUPERCLASS: AMNIOTA HAECKEL, 1866
CLASS: REPTILIA LAURENTI, 1768
SUBCLASS: DIAPSIDA OSBORN, 1903
INFRACLASS: NEODIAPSIDA BENTON, 1985
LEGION: LEPIDOSAUROMORPHA BENTON, 1983
SUBLEGION: LEPIDOSAURIA HAECKEL, 1866 (DUMERIL & BIBRON, 1839)
MAGNORDER: SQUAMATA, OPPEL, 1811
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
Infrafamily: NATANIA
Subfamily: MOSASAURINAE Gervais, 1853 (sensu Williston, 1897)
Tribe: MOSASAURINI Gervais, 1853 (sensu Russell, 1967)
Clidastes liodontus
Clidastes spSubfamily: PLATECARPINAE Williston, 1897
Tribe: PLIOPLATECARPINI Dollo, 1884 (sensu Russell, 1967)
Ectenosaurus
Subfamily: TYLOSAURINAE Williston, 1897
Tylosaurus sp
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