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Definition of flysch

i. A marine sedimentary facies characterized by a thick sequence of poorly fossiliferous, thinly bedded, graded deposits composed chiefly of marls, sandy and calcareous shales, and muds, rhythmically interbedded with conglomerates, coarse sandstones, and graywackes.

Ref: AGI

ii. An extensive, preorogenic sedimentary formation representing the totality of the facies deposited in different troughs, by rapid erosion of an adjacent and rising mountain belt at a time directly previous to the main paroxysmal (diastrophic) phase of the orogeny; specif., the Flysch strata of late Cretaceous to Oligocene age along the borders of the Alps, deposited before the main phase (Miocene) of the Alpine orogeny.

Ref: AGI

iii. A term that has been loosely applied to any sediment with most of the lithologic and stratigraphic characteristics of a flysch, such as almost any turbidite. Ethymol. dialectal term of German origin used in Switzerland for a crumbly or fissile material that slides or flows.

Compare with: molasse

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