WYOMING

BIG HORN COUNTY

BIG AL QUARRY

300 METERS NORTH OF HOW QUARRY

LOWER BRUSHY BASIN MEMBER

MORRISON FORMATION

ZONE 2

COMOBLUFFIAN AGE

KIMMERIDGIAN STAGE

UPPERMOST MALM EPOCH

LATE JURASSIC

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: THEROPODA EMEND MARSH, 1881

AVEPODA PAUL, 2002

SUPERORDER: NEOTHEROPODA BAKKER, 1986

GRANDORDER: TETANURAE GAUTHIER, 1986

ORDER: NEOTETANURAE SERENO, WILSON, LARSSON, DUTHEIL &

SUBORDER: AVETHEROPODA PAUL, 1988

Superfamily: ALLOSAUROIDEA Marsh, 1878 (sensu Currie & Zhao, 1994)

Family: ALLOSAURIDAE Marsh, 1878

Allosaurus jimmadseni

COHORT: ORNITHISCHIFORMES COOPER, 1985

SUPERORDER: SAUROPODOMORPHA HUENE, 1932

GRANDORDER: BRONTOSAURIA OLSHEVSKY, 1991 (emend)

MICRORDER: SAUROPODA MARSH, 1878

ORDER: EUSAUROPODA

SUBORDER: NEOSAUROPODA BONAPARTE, 1986

INFRAORDER: HOMALOSAUROPIA JANENSCH, 1929

PARVORDER: DIPLODOCIMORPHA CALVO & SALGADO, 1995

Superfamily: DIPLODOCOIDEA Marsh, 1884 (sensu Upchurch, 1995)

Family: DIPLODOCIDAE Marsh, 1884

Subfamily: DIPLODOCINAE Marsh, 1884 (sensu Janensch, 1929)

Diplodocus

MAGNORDER: ORNITHISCHIA SEELEY, 1888

SUPERORDER: EURYOPDA SERENO, 1986

GRANDORDER: STEGOSAUROMORPHA COOPER, 1985 (EMEND)

ORDER: STEGOSAURIA MARSH, 1877

Family: STEGOSAURIDAE Marsh, 1877

Subfamily: STEGOSAURINAE Marsh, 1877 (sensu ABEL, 1919)

Stegosaurus sp


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