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molasse A term originally used to describe the mainly shallow-marine and non-marine sediments produced from the erosion of a mountain belt after the final stage of uplift in an orogeny. It is now clear that much so-called molasse is not post-tectonic, but syntectonic, developed from the erosion of nappes while uplift and deformation are still progressing; some workers therefore consider that the term should be discontinued. See FLYSCH.

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