Abstract

The Menez-Belair synclinorium north of Rennes, France, is conceived to be a system of blocks uplifted along vertical faults. Movement, probably due to slow isostatic readjustment after orogeny, began at the close of the Paleozoic and continued through the Tertiary--during which time displacement of a hundred meters or so occurred--and possibly is still going on imperceptibly. This structural hypothesis probably can be extended to other synclinal zones in the Armorican massif.

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