Flysch's a sequence of sedimentary rocks that's deposited in a deep marine facies in the foreland basin of a developing orogen. Flysch's typically deposited during an early stage of the orogenesis. When the orogen evolves the foreland basin becomes shallower and molasse's deposited on top of the flysch. It's therefore called a syn-orogenic sediment (deposited contemporaneously with mountain building). Sedimentological properties Flysch consists of repeated sedimentary cycles with upwards fining… (More on Flysch)