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Mareuil Anticline
The Mareuil Anticline, also called Mareuil-Meyssac Anticline, is a structural high within the sedimentary sequence of the northeastern Aquitaine Basin. The northwest-southeast trending anticline was caused by tectonic movements probably starting in the Upper Cretaceous.
== Description of the structure ==
The anticline was named after Mareuil, a small town in the northwestern Dordogne, France. The centre of the structure is near Sainte-Croix-de-Mareuil, somewhat farther to the northwest. In plan view the anticline has the shape of an elongated pear with its long axis aligned NW-SE and reaching about 5 km in length (the Cenomanian/Turonian boundary serving as a reference horizon). The short axis is only 2 km in length. The structure is doubly asymmetric, with steeper dipping northeastern and northwestern limbs. It is accompanied on its northeastern side by the ''Mareuil Fault'', which starts at La Rochebeaucourt and continues to the north of Brantôme. Along this fault the northeastern side of the anticline was pushed up by about 30 m.
On the southeastern side of the anticline, there are several smaller cross-cutting faults locally disturbing the angle of dip. These cross faults are all following Riedel directions, either the R- or the R'-position, hinting at an underlying shear zone.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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