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- Decorah_Shale abstract "The Decorah Shale is a fossiliferous shale that makes up the lower most formation in the Galena Group. The Decorah lies above the Platteville Limestone and below the Galena Limestone in the sedimentary sequence that formed from the shallow sea that covered central North America during Ordovician Time. The Decorah consists of three members (from bottom to top): Spects Ferry, Guttenberg, and Ion. [1] The Spects Ferry member is organic-rich and suggests a large influx of terrigenous sediment during deposition. The Guttenberg is characterized by nodular calcareous beds and contains several K-bentonite deposits. The Ion Member, present in the southern Decorah in Iowa, is characterized by alternating beds of shale and limestone. Where it crops out in the Upper Midwest, especially in the Twin Cities, the Decorah is a popular place for amateur fossil collecting. It contains trilobites, brachiopods, horn corals, gastropods, crinoids, and large numbers of bryozoans. Cephalopods may also be found in the lower layers of the Decorah Shale.".
- Decorah_Shale wikiPageExternalLink stop-09.htm.
- Decorah_Shale wikiPageID "18497975".
- Decorah_Shale wikiPageRevisionID "557594135".
- Decorah_Shale hasPhotoCollection Decorah_Shale.
- Decorah_Shale subject Category:Geologic_formations_of_the_United_States.
- Decorah_Shale subject Category:Geology_of_Illinois.
- Decorah_Shale subject Category:Geology_of_Minnesota.
- Decorah_Shale subject Category:Geology_of_Missouri.
- Decorah_Shale subject Category:Geology_of_Nebraska.
- Decorah_Shale subject Category:Geology_of_South_Dakota.
- Decorah_Shale subject Category:Ordovician_geologic_formations.
- Decorah_Shale type Abstraction100002137.
- Decorah_Shale type Arrangement107938773.
- Decorah_Shale type Formation108426461.
- Decorah_Shale type GeologicFormationsOfTheUnitedStates.
- Decorah_Shale type Group100031264.
- Decorah_Shale comment "The Decorah Shale is a fossiliferous shale that makes up the lower most formation in the Galena Group. The Decorah lies above the Platteville Limestone and below the Galena Limestone in the sedimentary sequence that formed from the shallow sea that covered central North America during Ordovician Time. The Decorah consists of three members (from bottom to top): Spects Ferry, Guttenberg, and Ion.".
- Decorah_Shale label "Decorah Shale".
- Decorah_Shale sameAs m.04f4j6g.
- Decorah_Shale sameAs Q5249602.
- Decorah_Shale sameAs Q5249602.
- Decorah_Shale sameAs Decorah_Shale.
- Decorah_Shale wasDerivedFrom Decorah_Shale?oldid=557594135.
- Decorah_Shale isPrimaryTopicOf Decorah_Shale.