noun Geology.

  1. an association of certain types of marine sedimentary rocks characteristic of deposition in a foredeep.


  1. (sometimes not capital) a marine sedimentary facies consisting of a sequence of sandstones, conglomerates, marls, shales, and clays that were formed by erosion during a period of mountain building and subsequently deformed as the mountain building continued. The phenomenon was first observed in the Alps
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