SOUTH DAKOTA

FALL RIVER COUNTY

ANGUSTORIA RESERVOIR

BASE OF THE THIRD MEMBER

GREENHORN FORMATION

SCIPONOCERAS GRACILE ZONE

LATE CENOMANIAN STAGE

UPPER MIDDLE GALLIC SUBEPOCH

LOWERMOST EARLY CRETACEOUS EPOCH

MIDDLE CRETACEOUS

STEM: TETRAPODA GOODRICH, 1930

SUPERCLASS: AMNIOTA HAECKEL, 1866

CLASS: REPTILIA LAURENTI, 1768

SUBCLASS: DIAPSIDA OSBORN, 1904

SUPERLEGION: NEODIAPSIDA BENTON, 1985

LEGION: ARCHOSAUROMORPHA HUENE, 1946

SUPERCOHORT: AVEMETATARSALIA BENTON, 1999

COHORT: PROLACERTIFORMES CAMP, 1945 NOVA

SUPERORDER: TAPINOPLATIA PETERS, 2000

GRANDORDER: CHARACIOPODA PETERS, 2000

MICRORDER: FENESTRASAURIA PETERS, 2000

ORDER: PTEROSAURIA KAUP, 1834

Incertae sedis

Gen. sp indet.

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SOUTH DAKOTA

FALL RIVER COUNTY

ANGUSTORA RESERVOIR

GREENHORN FORMATION

BASAL CALCARENITE

ORMAN LAKE MEMBER

PLESIACANTHOCERAS WYOMINGENSE/DUNVEGANOCERAS PONDI ZONE

LOWER UPPER 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: 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

Subfamily: DOLICHOSAURIDAE Gervais, 1852

Tribe: DOLICHOSAURINI Gervais, 1852

Coniasaurus crassidens

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SOUTH DAKOTA

FALL RIVER COUNTY

EDGMONT

GREENHORN FORMATION

DISCONTINUOUS CALCARENITE BED NEAR THE MIDDLE OF THE THIRD MEMBER

SCIPONOCERAS GRACILE ZONE

UPPER 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: 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

Subfamily: DOLICHOSAURIDAE Gervais, 1852

Tribe: DOLICHOSAURINI Gervais, 1852

Coniasaurus crassidens

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SOUTH DAKOTA

FALL RIVER COUNTY

EDGMONT

GREENHORN FORMATION

BASAL CALCARENITES

SCIPONOCERAS GRACILE ZONE

UPPER 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: 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

Subfamily: DOLICHOSAURIDAE Gervais, 1852

Tribe: DOLICHOSAURINI Gervais, 1852

Coniasaurus crassidens

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SOUTH DAKOTA

FALL RIVER COUNTY

ANGUSTORA RESERVOIR

CALCARENITE BED IMMEDIATELY ABOVE THE SECOND MAJOR BENOTOINTE ABOVE THE BASE OF THE GREENHORN FORMATION

DUNVEGANOCERAS PONDI ZONE

LOWER UPPER 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: NEODIAPSIDA BENTON, 1985

LEGION: LEPIDOSAUROMORPHA BENTON, 1983

SUBLEGION: LEPIDOSAURIA HAECKEL, 1866 (DUMERIL & BIBRON, 1839)

MAGNORDER: SQUAMATA, OPPEL, 1811

SUPERORDER: LACERTILIA OWEN, 1842

Incertae sedis

Gen. sp indet.

 

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SOUTH DAKOTA

FALL RIVER COUNTY

ANGUSTORA RESERVOIR

GREENHORN FORMATION

80 CM BELOW THE FOURTH BENTONITE SEAM FROM THE BASE OF UNIT

ORMAN LAKE MEMBER

GREENHORN FORMATION

DUNVEGANOCERAS PONDI ZONE

EARLY UPPER CENOMANIAN STAGE

UPPER MIDDLE GALLIC SUBEPOCH

LOWERMOST EARLY CRETACEOUS 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

GRANDORDER: EOSAUROPTERYGIA emend RIEPPEL, 1994

ORDER: PLESIOSAURIA OWEN, 1840 NON BLAINVILLE, 1835

SUBORDER: PLESIOSAURIA OWEN, 1840 NON BLAINVILLE, 1835

INFRAORDER: PLIOSAUROMORPHA NOVA

Superfamily: PLIOSAUROIDEA Seeley, 1874

Family: PLIOSAURIDAE Seeley, 1874

Polyptychodon interruptus

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SOUTH DAKOTA

FALL RIVER COUNTY

EDGMONT

GREENHORN FORMATION

CALCARENITE BED NEAR THE MIDDLE OF THE THIRD MEMBER

SCIPONOCERAS GRACILE ZONE

UPPER CENOMANIAN STAGE

UPPER MIDDLE GALLIC EPOCH

LOWERMOST 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

GRANDORDER: EOSAUROPTERYGIA emend RIEPPEL, 1994

ORDER: PLESIOSAURIA OWEN, 1840 NON BLAINVILLE, 1835

SUBORDER: PLESIOSAURIA OWEN, 1840 NON BLAINVILLE, 1835

INFRAORDER: PLIOSAUROMORPHA NOVA

Superfamily: PLIOSAUROIDEA Seeley, 1874

Family: PLIOSAURIDAE Seeley, 1874

Polyptychodon interruptus

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