From detailed study of lithologic sequences in numerous sections in the French Alps and Pyrenees (and the Romanian Carpathians), it appears that a diagnostic petrographic criterion of the flysch facies is the appearance, in a shallow pelagic milieu, of recurrent zones of anisometric sandstones (marine sandstones with elements entirely lacking in mechanical preparation, of very dissimilar size). These zones, never developed in regular cycles, seem to be related to some factor which appeared and disappeared abruptly, interrupting the pelagic sedimentation for a time.

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