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APTIAN (Fr. Aptien, from Apt in Vaucl...

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Originally appearing in Volume V02, Page 234 of the 1911 Encyclopedia Britannica.
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APTIAN (Fr. Aptien, from See also:Apt in See also:Vaucluse, See also:France)  , in See also:geology, the See also:term introduced in 1843 by A. d'See also:Orbigny (See also:Pal . See also:France Cret. ii.) for the upper See also:stage of the See also:Lower Cretaceous rocks . In See also:England it comprises the Lower See also:Greensand and See also:part of the Speeton beds; in France it is divided into two sub-stages, the lower, " Bedoulian," of Bedoule in See also:Provence, with Hoplites deshayesei and Ancyloceras Matheroni; and an upper, " Gargasian," from Gargas near See also:Apt, with Hoplites furcatus (Dufrenoyi) and Phylloceras Guettardi . To this stage belong the Toucasia See also:limestone and Orbitolina marls of See also:Spain; the Schrattenkalk (part) of the Alpine and Carpathian regions; and the Terebrirostra limestone of the same See also:area . Parts of the See also:Flysch of the eastern See also:Alps, the Biancone of See also:Lombardy, and argile scagliose of See also:Emilia, are of See also:Aptian See also:age; so also are the " Trinity Beds " of See also:North See also:America . Deposits of See also:bauxite occur in the Aptian hippurite See also:lime-See also:stone at See also:Les Baux near See also:Arles, and in the See also:Pyrenees . The Aptian rocks are generally See also:clays, marls and See also:green glauconitic sands with occasional limestones .

End of Article: APTIAN (Fr. Aptien, from Apt in Vaucluse, France)
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