CONVERSE COUNTY
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: CARINATE MERREM, 1813
INFRACLASS: NEORNITHES GADOW, 1893
PARVCLASS: NEOGNATHAE PYCRAFT 1900
ORDER: GALLIFORMES (TEMMINCK, 1820)
Family: QUERCYMEGAPODIDAE Mourer-Chauvier, 1992
*Palintropus retusus
= Cimolopteryx retusus
= Apatornis retusus