Graneros Shale

E934193
Cretaceous stratigraphic unit geologic formation shale formation

Graneros Shale is a Cretaceous-age marine shale formation in the central United States, notable for recording the early transgression of the Western Interior Seaway and for its fossil-rich, fine-grained sediments.

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Observed surface forms (2)

Surface form Occurrences
Benton Shale 1
Mancos Shale 1

Statements (48)

Predicate Object
instanceOf Cretaceous stratigraphic unit ⓘ
geologic formation ⓘ
shale formation ⓘ
color dark gray ⓘ
contains bentonitic clay layers ⓘ
ironstone concretions ⓘ
organic-rich shale intervals ⓘ
siltstone interbeds ⓘ
country United States of America ⓘ
surface form: United States
depositionalEnvironment marine ⓘ
exposedIn Colorado NERFINISHED ⓘ
Kansas NERFINISHED ⓘ
Montana NERFINISHED ⓘ
Nebraska NERFINISHED ⓘ
South Dakota NERFINISHED ⓘ
Wyoming NERFINISHED ⓘ
fossilContent ammonites ⓘ
bivalves ⓘ
fish remains ⓘ
foraminifera ⓘ
marine invertebrate fossils ⓘ
ostracods ⓘ
geologicAge Cretaceous ⓘ
grainSize fine-grained ⓘ
lithology marine shale ⓘ
locatedIn central United States ⓘ
memberOf Colorado Group in some areas ⓘ
Colorado Shale in some classifications ⓘ
namedFor Graneros, Kansas NERFINISHED ⓘ
notableFor fossil-rich sediments ⓘ
recording early Western Interior Seaway flooding ⓘ
overlies Dakota Sandstone NERFINISHED ⓘ
paleoenvironment low-energy marine environment ⓘ
offshore shelf setting ⓘ
partOf Western Interior Seaway succession NERFINISHED ⓘ
primaryLithology shale ⓘ
records early transgression of the Western Interior Seaway ⓘ
region Great Plains ⓘ
Rocky Mountain region NERFINISHED ⓘ
researchUse paleoenvironmental reconstruction of Western Interior Seaway ⓘ
stratigraphic marker for early Cenomanian transgression ⓘ
series Upper Cretaceous NERFINISHED ⓘ
stage Cenomanian NERFINISHED ⓘ
stratigraphicPosition lies above Dakota Sandstone in many areas ⓘ
stratigraphicUnitRank formation ⓘ
system Cretaceous System NERFINISHED ⓘ
underlies Greenhorn Formation NERFINISHED ⓘ
Greenhorn Limestone NERFINISHED ⓘ

Referenced by (3)

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

Dakota Formation → underlies → Graneros Shale ⓘ
Western Interior Basin → includesFormation → Graneros Shale ⓘ
this entity surface form: Mancos Shale
Western Interior Basin → includesFormation → Graneros Shale ⓘ
this entity surface form: Benton Shale