MONTANA
YELLOWSTONE COUNTY
NEAR BILLINGS
LAKOTA FORMATION
POSSIBLY BARREMIAN STAGE
LOWER GALLIC SUBEPOCH
GULF EPOCH
EARLY 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
SUBLEGION: DINOSAUROMORPHA BENTON & NORMAN IN BENTON, 1985
INFRALEGION: DINOSAURIFORMES NOVAS, 1992
SUPERCOHORT: DINOSAURIA OWEN, 1842
COHORT: ORNITHISCHIFORMES COOPER, 1985
MAGNORDER: ORNITHISCHIA SEELEY, 1888
SUPERORDER: NEORNITHISCHIA COOPER, 1985
GRANDORDER: ORNITHOPODA MARSH, 1871
MICRORDER: EUORNITHOPODA SERENO, 1986
ORDER: IGUANODONTIA DOLLO, 1888
SUBORDER: ANKYLOPOLLEXIA SERENO, 1986
Family: CAMPTOSAURIDAE Marsh, 1885
Gen. sp indet.
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