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

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