Morrison Formation

E52675
geologic formation sedimentary rock formation stratigraphic unit

The Morrison Formation is a vast Late Jurassic sedimentary rock formation in the western United States renowned for its exceptionally rich assemblage of dinosaur fossils, including iconic sauropods and theropods.

Aliases (1)
Statements (55)
Predicate Object
instanceOf geologic formation →
sedimentary rock formation →
stratigraphic unit →
containsFossilGroup bivalves →
charophytes →
crocodyliforms →
early mammals →
gastropods →
ornithopod dinosaurs →
ostracods →
pollen and spores →
sauropod dinosaurs →
stegosaurian dinosaurs →
theropod dinosaurs →
turtles →
containsFossilTaxon Allosaurus →
Apatosaurus →
Brachiosaurus →
Camarasaurus →
Diplodocus →
Dryosaurus →
Othnielosaurus →
Stegosaurus →
containsRockType conglomerate →
country United States →
depositionalEnvironment eolian →
floodplain →
fluvial →
lacustrine →
discoveredIn 19th century →
fossilRichness exceptionally rich dinosaur fossil assemblage →
geographicExtent from Arizona to South Dakota →
from New Mexico to Montana →
geologicAgeRange Kimmeridgian →
Tithonian →
geologicGroup San Rafael Group →
geologicPeriod Late Jurassic →
locatedInRegion western United States →
namedFor Morrison, Colorado →
notableLocality Cleveland-Lloyd Dinosaur Quarry →
Como Bluff →
Dinosaur National Monument →
Garden Park, Colorado →
overlies Summerville Formation →
Sundance Formation →
paleontologicalSignificance one of the most productive dinosaur-bearing formations in the world →
primaryLithology limestone →
mudstone →
sandstone →
siltstone →
thickness up to about 300 meters →
timeSpanEndMa approximately 146 →
timeSpanStartMa approximately 156 →
underlies Cloverly Formation →
Dakota Formation →
Referenced by (5)
Subject (surface form when different) Predicate
Saurophaganax maximus →
formation
Jurassic Period →
hasNotableFossilSite
Late Jurassic →
notableFossilSite
Colorado Plateau →
notableRockFormations
Saurophaganax maximus ("Upper Morrison Formation") →
typeStratum
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