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Statements

Subject Item
dbr:Decorah_Shale
rdf:type
yago:Arrangement107938773 yago:Formation108426461 yago:WikicatGeologicFormationsOfTheUnitedStates yago:WikicatOrdovicianGeologicFormations yago:Abstraction100002137 yago:Group100031264
rdfs:label
Decorah Shale
rdfs:comment
The Decorah Shale is a fossiliferous shale that makes up the lowermost formation in the Galena Group. The Decorah lies above the Platteville Limestone and below the Cummingsville Formation 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): Spechts Ferry, Guttenberg, and Ion. The Spechts 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.
dbp:name
Decorah Shale
foaf:depiction
n9:Decorah_Formation_in_Decorah_Iowa.jpg
dct:subject
dbc:Ordovician_geology_of_South_Dakota dbc:Ordovician_geology_of_Wisconsin dbc:Ordovician_System_of_North_America dbc:Ordovician_Illinois dbc:Ordovician_Iowa dbc:Shale_formations_of_the_United_States dbc:Ordovician_Missouri dbc:Ordovician_Minnesota dbc:Ordovician_Nebraska
dbo:wikiPageID
18497975
dbo:wikiPageRevisionID
1049302571
dbo:wikiPageWikiLink
dbr:Galena_Group dbr:Trilobite dbr:Brachiopod dbr:Minnesota dbc:Ordovician_System_of_North_America dbr:Platteville_Limestone dbc:Shale_formations_of_the_United_States dbr:United_States dbr:Platteville_Formation dbc:Ordovician_Illinois dbc:Ordovician_Iowa dbr:Upper_Midwest dbr:Twin_Cities dbr:Decorah,_Iowa dbr:Crinoid dbc:Ordovician_Missouri dbr:Gastropod dbr:Fossiliferous dbr:Cummingsville_Formation dbc:Ordovician_geology_of_South_Dakota dbc:Ordovician_geology_of_Wisconsin dbr:Bryozoan dbc:Ordovician_Minnesota dbc:Ordovician_Nebraska dbr:Formation_(stratigraphy) dbr:Ordovician
owl:sameAs
yago-res:Decorah_Shale freebase:m.04f4j6g wikidata:Q5249602 n19:4iZsg
dbp:underlies
dbr:Galena_Group
dbp:wikiPageUsesTemplate
dbt:US-geologic-formation-stub dbt:Reflist dbt:Infobox_rockunit dbt:Paleozoic_Stratigraphy_of_the_Upper_Midwest
dbo:thumbnail
n9:Decorah_Formation_in_Decorah_Iowa.jpg?width=300
dbp:age
dbr:Ordovician
dbp:caption
Decorah Shale exposed in Decorah, Iowa. The Decorah is gray; above it is the brown Cummingsville Formation.
dbp:country
dbr:United_States
dbp:period
Ordovician
dbp:type
dbr:Formation_(stratigraphy)
dbo:abstract
The Decorah Shale is a fossiliferous shale that makes up the lowermost formation in the Galena Group. The Decorah lies above the Platteville Limestone and below the Cummingsville Formation 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): Spechts Ferry, Guttenberg, and Ion. The Spechts 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 stratum 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.
dbp:extent
dbr:Minnesota
dbp:overlies
dbr:Platteville_Formation
gold:hypernym
dbr:Shale
prov:wasDerivedFrom
wikipedia-en:Decorah_Shale?oldid=1049302571&ns=0
dbo:wikiPageLength
2894
foaf:isPrimaryTopicOf
wikipedia-en:Decorah_Shale