COLORADO

ARAPHOE AND ELBERT COUNTIES

SOUTHWEST OF COLORADO SPRINGS

WEST BIJOU STUDY AREA

CORRAL BLUFFS

DENVER FORMATION

LOWER PALEOCENE EPOCH

EARLY PALEOGENE

LOWER TERTIARY SUBERA

CENOZOIC ERA

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: CRUROTARSI SERENO & ARCUCCI, 1990

COHORT: CROCODYLOTARSI BENTON & CLARK, 1988

MAGNORDER: SUCHIA KREBS, 1974

SUPERORDER: CROCODYLOMORPHA WALKER, 1968

GRANDORDER: CROCODILIFORMES HAY, 1930

MICRORDER: MESOEUROCROCODYLIA WHETSTONE & WHYBROW, 1983

ORDER: EUSUCHIA emend HUXLEY, 1875

Family: BOREALOSUCHIDAE emend BROCHU, 1999

Borealosuchus sternbergii
= Leidyosuchus sternbergii

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ICHNOSUPERCLASS: AMNIOTAIPIDII NOVA

ICHNOCLASS: REPTILIPEDIA VIALOV, 1966

ICHNOSUBCLASS: CHELONOMORPHIPEDII EMEND VIALOV, 1966

ICHNOORDER: TESTUDIPEDIA EMEND VIALOV, 1966

Family: Incerate sedis

Gen. sp indet.
Note: Body pits with egg chambers and belly drag from a turtle the size of Protostega gigas.

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COLORADO

ELBERT COUNTY

UPPERMOST PIERRE FORMATION

EARLY MAASRICHTIAN STAGE

UPPER SENONIAN SUBEPOCH

UPPER GULF EPOCH

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 nova

Family: ELASMOSAURIDAE Cope, 1869

Gen. sp. indet.