Sequence of shales interbedded with thin, hard, graywacke-like sandstones. Such sequences are usually thousands of yards thick, but the individual beds are only a few inches to a few yards thick. The occasional presence of fossils indicates marine deposition. The term originally was applied to a formation of the Tertiary Period (now divided into the Paleogene and Neogene periods) in the northern Alpine region, but now flysch denotes similar deposits of other ages and places.

This entry comes from Encyclopædia Britannica Concise.
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