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Encyclopedia Britannica



APTIAN (Fr. Aptien, from Apt in Vaucluse, France)

This article appears in Volume V02, Page 234 of the Encyclopedia Britannica.

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


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