MONTANA

STILLWATER COUNTY

LAKE BASIN (NEAR BIG LAKE)

BEARPAW FORMATION

UPPER CAMPANIAN-MAASTRICHTIAN 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

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

INFRAORDER: STYRACOSTERNA SERENO, 1986

PARVORDER: HADROSAURIFORMES SERENO, 1997

SUPERFAMILY: HADROSAUROIDEA COPE, 1869 (SENSU SERENO, 1986)

Family: HADROSAURIDAE COPE, 1869

Subfamily: HADROSAURINAE Cope, 1869 (sensu Lambe, 1918)

Tribe: KRITOSAURINI nova

Gryposaurus notabilis
= Hadrosaurus notabilis
= Kritosaurus notabilis

Subfamily: LAMBEOSAURINAE Parks, 1923

Tribe: CORYTHOSAURINI Brett-Surman vide Chapman & Brett-Surman, 1990

Lambeosaurus magnicristatus

SUPERORDER: EURYOPDA SERENO, 1986

GRANDORDER: ARMATOSAURIA ZHAO, 1983 (emend)

ORDER: ANKYLOSAURIA OSBORN, 1923

SUBORDER: SCELIDOSAURIA COOPER, 1985

INFRAORDER: ANKYLOSAURA OSBORN, 1923

Family: NODOSAURIDAE Marsh, 1890

Subfamily: PANOPLOSAURINAE Nopcsa, 1919

Panoplosaurus sp