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BATHONIAN SERIES

Online Encyclopedia
Originally appearing in Volume V03, Page 513 of the 1911 Encyclopedia Britannica.
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BATHONIAN

SERIES  , in geology . The typical Bathonian is the
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Great Oolite series of England, and the name was derived from the " Bath Oelite," so extensively
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mined and quarried in the vicinity of that city, where the
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principal strata were first studied by W . Smith . The
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term was first used by J. d'
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Omalius d'ilalloy in 1843 (Precis Geol.) as a synonym for " Dogger "; but it was limited in 1849 by A. d'Orbigny (Pal .
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Franc . Jun. i. p . 607) . In 1864 Mayer-Eymar (
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Tabl . Synchron.) used the word " Bathien "=
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Bajocian+Bathonian (sen. str.) . According to
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English practice, the Bathonian includes the,following formations in descending order:
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Cornbrash,
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Forest Marble with Bradford Clay, Great or Bath Oolite, Stonesfield Slate and Fullers' Earth . (The Fullers' Earth is sometimes regarded as constituting a
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separate stage, the " Fullonian.") The " Bathonien " of some French geologists differs from the English Bathonian in that it includes at the
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base the zone of the ammonite Parkinsonia Parkinso-ni, which in England is placed at the
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summit of the Inferior Oolite . The Bathonian is the
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equivalent of the upper
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part of the " Dogger " (
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Middle
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Jurassic) of Germany, or to the base of the Upper Brown Jura (substage " E " of Quenstedt) .

Rocks of Bathonian

age arc well
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developed in
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Europe: in the N.W. and S.W. polite limestones are characteristically associated with
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coral-hearing, crinoidal and other varieties, and with certain beds of clay . In the N. and N.E., Russia, &c., clays, sandstones and ferruginous oolites prevail, some of the last being exploited for iron . They occur also in the extreme north of
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America and in the Arctic regions, Greenland, Franz Josef
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Land, &c.; in Africa, Algeria, German East Africa,
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Madagascar and near the Cape (Enon Beds); in India,
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Rajputana and Gulf of Cutch, and in South America . The well-known
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Caen stone of
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Normandy and " Hauptrogenstein" of Swabia, as well as the "Eisenkalk" of N.W . Germany, and " Klaus-Schichten " of the
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Austrian
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Alps, are of Bathonian age . For a general account, see A. de Lapparent, Traite de g'ologie (5th ed., 1906), vol. ii.; see also the article JURASSIC . (J . A .

End of Article: BATHONIAN SERIES
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