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- Niobrara_Formation abstract "The Niobrara Formation /ˌnaɪ.əˈbrærə/, also called the Niobrara Chalk, is a geologic formation in North America that was laid down between 87 and 82 million years ago during the Coniacian, Santonian, and Campanian ages of the Late Cretaceous. It is composed of two structural units, the Smoky Hill Chalk Member overlying the Fort Hays Limestone Member. The chalk formed from the accumulation of coccoliths from microorganisms living in what was once the Western Interior Seaway, an inland sea that divided the continent of North America during much of the Cretaceous. It underlies much of the Great Plains of the US and Canada. Evidence of vertebrate life is common throughout the formation and includes specimens of plesiosaurs, mosasaurs, and pterosaurs as well as several primitive aquatic birds. The type locality for the Niobrara Chalk is Knox County in northeastern Nebraska.".
- Niobrara_Formation wikiPageExternalLink index.php?option=com_content&task=view&id=2539&Itemid=75.
- Niobrara_Formation wikiPageExternalLink www.niobrarachalk.com.
- Niobrara_Formation wikiPageExternalLink www.oceansofkansas.com.
- Niobrara_Formation wikiPageID "19107206".
- Niobrara_Formation wikiPageRevisionID "603380172".
- Niobrara_Formation age Campanian.
- Niobrara_Formation age Coniacian.
- Niobrara_Formation hasPhotoCollection Niobrara_Formation.
- Niobrara_Formation name "Niobrara Formation".
- Niobrara_Formation otherlithology Shale.
- Niobrara_Formation prilithology Chalk.
- Niobrara_Formation region North_America.
- Niobrara_Formation subunits Smoky_Hill_Chalk.
- Niobrara_Formation subunits Fort_Hays_Limestone.
- Niobrara_Formation type Formation_(stratigraphy).
- Niobrara_Formation underlies Pierre_Shale.
- Niobrara_Formation subject Category:Chalk.
- Niobrara_Formation subject Category:Cretaceous_paleontological_sites_of_North_America.
- Niobrara_Formation subject Category:Geology_of_Kansas.
- Niobrara_Formation type CretaceousPaleontologicalSitesOfNorthAmerica.
- Niobrara_Formation type GeographicalArea108574314.
- Niobrara_Formation type Location100027167.
- Niobrara_Formation type Object100002684.
- Niobrara_Formation type PhysicalEntity100001930.
- Niobrara_Formation type Region108630985.
- Niobrara_Formation type Site108651247.
- Niobrara_Formation type Tract108673395.
- Niobrara_Formation type YagoGeoEntity.
- Niobrara_Formation type YagoLegalActorGeo.
- Niobrara_Formation type YagoPermanentlyLocatedEntity.
- Niobrara_Formation comment "The Niobrara Formation /ˌnaɪ.əˈbrærə/, also called the Niobrara Chalk, is a geologic formation in North America that was laid down between 87 and 82 million years ago during the Coniacian, Santonian, and Campanian ages of the Late Cretaceous. It is composed of two structural units, the Smoky Hill Chalk Member overlying the Fort Hays Limestone Member.".
- Niobrara_Formation label "Niobrara Formation".
- Niobrara_Formation sameAs m.04jc5_w.
- Niobrara_Formation sameAs Q7039335.
- Niobrara_Formation sameAs Q7039335.
- Niobrara_Formation sameAs Niobrara_Formation.
- Niobrara_Formation wasDerivedFrom Niobrara_Formation?oldid=603380172.
- Niobrara_Formation isPrimaryTopicOf Niobrara_Formation.