flysch /flɪʃ/ noun1 •A series of sandstones and schists overlying the true nummulitic formation in the Alps, and included in the Eocene Tertiary.Most of the structures and textures observed at Ponkapoag section have been noted in turbitite and flysch sequences. — 1934 formsflysches
Flysch noun1 •A set of tertiary strata in the Alps.The lower part of the rock section over which you have just climbed is the Flysch: dark grey slaty rocks that come out in small shards if you pick at them with your fingers. — 2004
