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The Portland Group (defining the Portlandian) is a Late Jurassic (Tithonian) lithostratigraphic group (a sequence of rock strata) in South East England. The name is derived from the Isle of Portland in Dorset where the strata are exposed and have been extensively worked. Rocks of this age have in the past been called the Portlandian stage by geologists, which corresponds with the late Tithonian stage of the internationally used geological timescale.

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  • Portlandien (fr)
  • Portland Group (geology) (en)
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  • The Portland Group (defining the Portlandian) is a Late Jurassic (Tithonian) lithostratigraphic group (a sequence of rock strata) in South East England. The name is derived from the Isle of Portland in Dorset where the strata are exposed and have been extensively worked. Rocks of this age have in the past been called the Portlandian stage by geologists, which corresponds with the late Tithonian stage of the internationally used geological timescale. (en)
  • Le Portlandien est une subdivision de l'échelle des temps géologiques, équivalent à l'étage du Tithonien. Son stratotype est caractérisé par les calcaires et grès de l'île de Portland en Angleterre. Depuis 1990, le Tithonien remplace le Portlandien, avec une partie du Kimméridgien. Dans les massifs subalpins du nord des Alpes françaises, le Portlandien était représenté par le faciès tithonique. (fr)
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  • Portland Group (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Cliffs,_west_side_of_Portland_-_geograph.org.uk_-_1316572.jpg
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  • Cliffs of the Portland Stone Formation on the western side of Portland Bill (en)
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  • Tithonian (en)
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  • The Portland Group (defining the Portlandian) is a Late Jurassic (Tithonian) lithostratigraphic group (a sequence of rock strata) in South East England. The name is derived from the Isle of Portland in Dorset where the strata are exposed and have been extensively worked. Rocks of this age have in the past been called the Portlandian stage by geologists, which corresponds with the late Tithonian stage of the internationally used geological timescale. (en)
  • Le Portlandien est une subdivision de l'échelle des temps géologiques, équivalent à l'étage du Tithonien. Son stratotype est caractérisé par les calcaires et grès de l'île de Portland en Angleterre. Depuis 1990, le Tithonien remplace le Portlandien, avec une partie du Kimméridgien. Dans les massifs subalpins du nord des Alpes françaises, le Portlandien était représenté par le faciès tithonique. (fr)
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