Cyclic Sedimentation, Edition: First Edition by P.McL. D. Duff, A. Hallam and E.K. Walton (Eds.)

By P.McL. D. Duff, A. Hallam and E.K. Walton (Eds.)

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Extra info for Cyclic Sedimentation, Edition: First Edition

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Such research has also revealed the masking of cyclic episodes in areas where lithologies are not suitable. The importance of this approach, involving as it does inter- as well as intra-continental correlation, is that it provides one of the few known criteria for distinguishing eustatic changes of sea-level from local epeirogenic or sedimentary controls of cyclic sedimentation. CLASSIFICATION AND DESCRIPTION We have adopted a scheme of classification which is based on rather broad environments of sedimentation.

Invertebrate No proofs of exposure Vertical accretion deposit from overbank floods. Levee and backswamp deposits with area possibly a lake for long periods. Red, flat- or ripple-bedded very fine to fine sandstone with a channeled scoured surfoce in lower Dart. Scattered siltstone ciasts. Probably mixed channel-fill ond lateral accretion deposits. Deposition of suspended and bed loads on channel bars and sand flats. Deepening or wandering of channel at times. l i 1 . . . . . , .. , . ,. ,. ,.

R. L. Allen’s analyses of the Old Red Sandstone cycles in Britain and underlines the difficulties in delimiting cycles in fluviatile deposits. The Molasse of Switzerland is a very varied succession including marine, freshwater and fluviatile deposits which range in composition from conglomerates to 34 CYCLES IN FLUVIAL REGIMES coals and limestones. This discussion is restricted to the deposits around Lausanne of Aquitanian age (BERSIER, 1958) although CROUZEL (1957) described similar sediments from the Aquitaine Basin.

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