WEST-CENTRAL KANSAS

NEAR UTICA

SMOKY HILL CHALK MEMBER

NIOBRARA FORMATION

UPPER CONICIAN STAGE

LOWER SENONIAN SUBSTAGE

LOWER GULF EPOCH

EARLY LATE CRETACEOUS-SANTONIAN STAGE

MIDDLE SENONIAN SUBEPOCH

UPPERMIDDLE 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: RUSSELLOSAURINAE

Tribe: PLIOPLATECARPINI Dollo, 1884 (sensu Russell, 1967)

Platecarpus coryphaeus

KANSAS

TWO MILE CREEK

SMOKY HILL MEMBER

NIOBRARA FORMATION

CONIACIAN STAGE

SENONIAN SUBEPOCH

GULF EPOCH

LATE CRETACEOUS
STEM: TETRAPODA GOODRICH, 1930
SUPERCLASS: AMNIOTA HAECKEL, 1866

CLASS: AVES LINNAEUS, 1758

AVEBREVICAUDA PAUL, 2001

SUBCLASS: ODONTORNITHES MARSH, 1873

INFRACLASS: ODONTOHOLCAE NOVA

MAGNORDER: HESPERORNITHES

ORDER: HESPERORNITHIFORMES FURBRINGER, 1888

Family: HESPERORNITHIDAE Marsh, 1872

Subfamily: HESPERORNITHINAE Marsh, 1872

Hesperornis regalis