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- Spearfish_Formation abstract "The Spearfish Formation is a geologic formation, originally described from the Black Hills region of South Dakota, United States, but also recognised in North Dakota, Wyoming, Montana and Nebraska. It is a heterogeneous red bed formation, commonly with siltstone and gypsum low in the formation and sandstone and shale higher up. Other rock types include claystone, conglomerate, dolomite, and oil shale. It is typically regarded as Permian–Triassic in age, although its original description included Jurassic rocks.The Spearfish Formation is interpreted as representing shallow marine to coastal terrestrial deposition, like the modern Persian Gulf. Depositional environments may have included restricted marine bodies and ephemeral lakes (gypsum), hypersaline waters (limestone), hypersaline microbial mats (oil shale), and sabkhas (dolomite). The marine waters of the shallow continental sea retreated during the deposition of the formation, reflected in a change from dominantly nearshore marine to coastal terrestrial deposition over time.The Spearfish Formation is sparsely fossiliferous. So far, only stromatolites, casts of bivalves, and trace fossils have been found.".
- Spearfish_Formation wikiPageID "38040335".
- Spearfish_Formation wikiPageRevisionID "557560915".
- Spearfish_Formation age Permian.
- Spearfish_Formation age Triassic.
- Spearfish_Formation country United_States.
- Spearfish_Formation hasPhotoCollection Spearfish_Formation.
- Spearfish_Formation name "Spearfish Formation".
- Spearfish_Formation namedby "Darton, 1899".
- Spearfish_Formation namedfor Spearfish,_South_Dakota.
- Spearfish_Formation overlies Minnekahta_Limestone.
- Spearfish_Formation region "Black Hills and nearby states".
- Spearfish_Formation type Formation_(stratigraphy).
- Spearfish_Formation underlies Ellis_Group.
- Spearfish_Formation underlies Gypsum_Spring_Formation.
- Spearfish_Formation underlies Sundance_Formation.
- Spearfish_Formation subject Category:Geologic_formations_of_the_United_States.
- Spearfish_Formation subject Category:Mesozoic_geologic_formations.
- Spearfish_Formation subject Category:Paleozoic_geologic_formations.
- Spearfish_Formation comment "The Spearfish Formation is a geologic formation, originally described from the Black Hills region of South Dakota, United States, but also recognised in North Dakota, Wyoming, Montana and Nebraska. It is a heterogeneous red bed formation, commonly with siltstone and gypsum low in the formation and sandstone and shale higher up. Other rock types include claystone, conglomerate, dolomite, and oil shale.".
- Spearfish_Formation label "Spearfish Formation".
- Spearfish_Formation sameAs m.0pcm6lk.
- Spearfish_Formation sameAs Q7574380.
- Spearfish_Formation sameAs Q7574380.
- Spearfish_Formation wasDerivedFrom Spearfish_Formation?oldid=557560915.
- Spearfish_Formation isPrimaryTopicOf Spearfish_Formation.