About: Niobrara Formation

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The Niobrara Formation /ˌnaɪ.əˈbrærə/, also called the Niobrara Chalk, is a geologic formation in North America that was deposited between 87 and 82 million years ago during the Coniacian, Santonian, and Campanian stages 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

Attributes	Values
rdf:type	yago:WikicatCretaceousPaleontologicalSitesOfNorthAmerica geo:SpatialThing yago:GeographicalArea108574314 yago:Location100027167 yago:Object100002684 yago:PhysicalEntity100001930 yago:Region108630985 yago:YagoGeoEntity yago:YagoLegalActorGeo yago:YagoPermanentlyLocatedEntity yago:Site108651247 yago:Tract108673395
rdfs:label	ニオブララ累層 (ja) Niobrara Formation (en)
rdfs:comment	ニオブララ累層（ニオブララるいそう）は、後期白亜紀のコニアシアン、サントニアン、カンパニアンにあたる8700 - 8200万年前に堆積した、北アメリカの地層。2つの構造ユニットからなり、スモーキーヒルチョーク部層がフォートヘイズ石灰岩部層の上に横たわっている。西部内陸海路（白亜紀の大部分において北アメリカを分断した内海）に生息した微生物に由来する円石から構成されており、アメリカ合衆国とカナダのグレートプレーンズの大部分の下に存在する。脊椎動物の化石証拠は層全体を通して共通しており、首長竜・モササウルス科・翼竜・原始的な水鳥の標本が産出している。ニオブララ累層のタイプ産出地はアメリカ合衆国ネブラスカ州北東部のノックス郡である。 (ja) The Niobrara Formation /ˌnaɪ.əˈbrærə/, also called the Niobrara Chalk, is a geologic formation in North America that was deposited between 87 and 82 million years ago during the Coniacian, Santonian, and Campanian stages 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 (en)
name	Niobrara Formation (en)
geo:lat	42.747002 (xsd:float)
geo:long	-98.040001 (xsd:float)
foaf:depiction
dcterms:subject	Geologic formations of Wyoming Cretaceous Kansas Cretaceous geology of North Dakota Cretaceous geology of South Dakota Cretaceous geology of Wyoming Paleontology in Colorado Upper Cretaceous Series of North America Paleontology in North Dakota Paleontology in South Dakota Cretaceous Colorado Geologic formations of Nebraska Cretaceous geology of Nebraska Geologic formations of Kansas Paleontology in Nebraska Paleontology in New Mexico Coniacian Stage Shale formations of the United States Cretaceous formations of New Mexico Geologic formations of North Dakota Campanian Stage Santonian Stage Shallow marine deposits Paleontology in Wyoming Fossiliferous stratigraphic units of North America Geologic formations of Colorado Chalk Reservoir rock formations Geologic formations of South Dakota Paleontology in Kansas
Wikipage page ID	19107206 (xsd:integer)
Wikipage revision ID	1071303188 (xsd:integer)
Link from a Wikipage to another Wikipage	Campanian Geologic formations of Wyoming Cretaceous Kansas Cretaceous geology of North Dakota Cretaceous geology of South Dakota Pueblo, Colorado Quaternary Samuel Wendell Williston Santonian Benjamin Franklin Mudge Bird Boulder, Colorado Cretaceous geology of Wyoming Paleontology in Colorado Upper Cretaceous Series of North America Paleontology in North Dakota Paleontology in South Dakota Cretaceous Colorado University of Kansas Coniacian Cretaceous George F. Sternberg North Park (Colorado basin) Mosasaur Geologic formations of Nebraska Benton Shale Cretaceous geology of Nebraska Lyons, Colorado Smoky Hill Chalk Denver Basin Geologic formations of Kansas Cenomanian Paleontology in Nebraska Paleontology in New Mexico Coniacian Stage Shale formations of the United States Dakota Formation Dakota Hogback Ferdinand Vandeveer Hayden Florence, Colorado Fort Hays Limestone Member Niobrara River Othniel Charles Marsh Knox County, Nebraska Petroleum industry

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