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

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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. The type locality for the Niobrara Chalk is the Niobrara River in Knox County in northeastern Nebraska. The formation gives its name to the Niobrara cycle of the Western Interior Seaway. (en)
  • 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)
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dbp:caption
  • Smoky Hill Chalk badlands, Niobrara Formation, in Kansas (en)
dbp:name
  • Niobrara Formation (en)
dbp:namedby
  • Meek, F.B., and Hayden, F.V. (en)
dbp:namedfor
  • Niobrara River, Knox Co., Nebraska (en)
dbp:otherlithology
dbp:overlies
dbp:period
  • Campanian (en)
dbp:prilithology
dbp:region
  • North America (en)
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  • 1862 (xsd:integer)
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  • 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)
rdfs:label
  • ニオブララ累層 (ja)
  • Niobrara Formation (en)
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