Abstract
Abstract Marine clastic formations of Cambrian, Ordovician, and Silurian age in the Flamanville area of northwestern France were folded during the Caledonian orogeny into a series of broad anticlinal and synclinal folds with the tops of the anticlines emergent and undergoing erosion by early Devonian time. The earlier Devonian formations were formed by deposition of the detritus in the adjacent synclinal troughs. Later deposits formed after renewed subsidence show facies differences between the marine shallow-water areas of the anticlinal crests, the deeper water of the flanks, and the deepest water of the synclinal troughs. Ferruginous oolite beds occur in marine sandy shales in the northern part of the area, and veinlets of lead-zinc mineralization occur in the southern part. The minerals probably were deposited in the original sediments, and later metamorphosed by intrusion of the Flamanville granite whose contact-metamorphic effects are prominent. The iron mineralization probably was deposited in marine shallows, and the lead-zinc minerals in adjoining belts.
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