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BAJOCIAN

Online Encyclopedia
Originally appearing in Volume V03, Page 226 of the 1911 Encyclopedia Britannica.
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BAJOCIAN  , in

geology, the name proposed in 1849 by d'Orbigny for the rocks of
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Middle
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Jurassic age which are well
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developed in the neighborourhood of
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Bayeux,
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Calvados . The Bajocian stage is practically
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equivalent to the Inferior Oolite of ,
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British geologists . It corresponds fairly closely with the
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Lower and Middle Brown Jura of Quenstedt, and with the Dogger of Oppel . By means of the fossil
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ammonites the Bajocia strata have been subdivided into the following zones, in descending order: Zone of Parkinsonia Parkinsoni and Cosnaoceras garantianum Coeloceras subcoronatum (Humphriesianum) Sonninia Romani Stephaeoceras Sowerbyi Harpoceras concavum Murchisonae Substage Aalenien opalinum of Mayer-Eymar . It should be remarked that some
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European geologists prefer to include the Parkinsonia zone in tile
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base of the overlying Bathonian (q.v.) . The Bajocian rocks of
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Europe are mostly limestones of various kinds, very frequently oolitic . At Bayeux, the type
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district, they are ferruginous oolites; in the Jura and
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Lorraine a
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coral
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limestone overlies a crinoidal variety; calcareous sandy and many beds occur in Maine and
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Anjou; in
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Poitou the limestone is dolomitic and bears nodules of chert . Rocks of the same age, as recognized by their fossil contents, have a wide range; they are found in north Africa,
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Goa,
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Somaliland, German East Africa, and north-west
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Madagascar; through
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southern Europe they may be followed into Turkestan, and-the Kota-Maleri beds of the Upper
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Gondwana series of India may possibly belong to this stage . In South
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America they appear in
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Bolivia, Chile and
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Argentina; in North America, in British
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Columbia, Dakota, Mexico,
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Oregon and California . The Bajocian sea also included parts of New South Wales, New Zealand (Flag Hills beds ?),
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Borneo and
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Japan, and it extended into the polar region of eastern Greenland and Franz Josef
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Land . In addition to the ammonites already mentioned, the large belemnites (Megateuthis giganteus) and terebratulas (T. perovalis) are worthy of
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notice; crinoids and corals were abundant, and so also were certain forms of Trigonia (T. costata), Pleurotomaria and Cidaris . See JuRAssic; also A. de Lapparent, Traite de geologie, vol. ii .

(5th ed., 1906); and H . B .

Woodward, " The Jurassic Rocks of Britain," vol. iv., 1894 (Mem . Geol . Survey) ; both
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works contain references to
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original papers . (J . A .

End of Article: BAJOCIAN
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