Abstract
Abstract Deep borings in the Saone and Bresse plains, France, show that the Triassic section of the western Jura mountains thins rapidly westward. All zones within the section exhibit a reduction in thickness. Triassic sedimentation is considered to have occurred in a gulf south of the emergent Morvan massif, which is believed to have reached the northern border region of the Central Massif. West of La Chatre certain variegated clays attributed to the Triassic are Liassic deposits instead.
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