Pierre Shale

E364206
geologic formation sedimentary rock unit stratigraphic unit

Pierre Shale is a widespread Late Cretaceous marine sedimentary rock formation of the Western Interior Seaway in North America, known for its rich fossil content and extensive outcrops across the Great Plains and Rocky Mountain regions.

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All labels observed (1)

Label Occurrences
Pierre Shale canonical 3

Statements (48)

Predicate Object
instanceOf geologic formation ⓘ
sedimentary rock unit ⓘ
stratigraphic unit ⓘ
age Campanian ⓘ
Maastrichtian ⓘ
basin Western Interior Seaway ⓘ
chronostratigraphicUnit Late Cretaceous ⓘ
surface form: Upper Cretaceous
color dark gray ⓘ
contains bentonite layers ⓘ
concretions ⓘ
containsFossilsOf ammonites ⓘ
fish ⓘ
foraminifera ⓘ
inoceramid bivalves ⓘ
marine reptiles ⓘ
mosasaurs ⓘ
plesiosaurs ⓘ
trace fossils ⓘ
country United States of America ⓘ
surface form: United States
depositionalEnvironment marine ⓘ
depositionalSetting offshore marine shelf ⓘ
geologicPeriod Late Cretaceous ⓘ
hasSubunits Crow Creek Member ⓘ
Mitten Black Shale Member ⓘ
Pembina Member ⓘ
Sharon Springs Member ⓘ
isEconomicallyImportantFor groundwater aquifers in some areas ⓘ
isKnownFor extensive outcrops ⓘ
rich fossil content ⓘ
isPartOf Colorado Group in some regions ⓘ
lithology shale ⓘ
namedFor Fort Pierre, South Dakota ⓘ
outcropsIn Colorado ⓘ
Kansas ⓘ
Montana ⓘ
Nebraska ⓘ
New Mexico ⓘ
North Dakota ⓘ
South Dakota ⓘ
Wyoming ⓘ
overlies Niobrara Chalk ⓘ
surface form: Niobrara Formation
primaryLithology dark gray shale ⓘ
region Great Plains ⓘ
Rocky Mountain region ⓘ
stratigraphicUnitOf Western Interior Basin ⓘ
thickness up to several hundred meters ⓘ
underlies Fox Hills Sandstone ⓘ
Laramie Formation ⓘ

Referenced by (3)

Full triples — surface form annotated when it differs from this entity's canonical label.

Hell Creek Formation → overlies → Pierre Shale ⓘ
Fox Hills Formation → overlies → Pierre Shale ⓘ
Western Interior Basin → includesFormation → Pierre Shale ⓘ