DEFINITION OF FLYSCH

A synorogenic clastic deposit typically marked by

interbedded shales and sandstones. The term was first used

for rocks deposited in the Alps in the Cretaceous-Tertiary,

before the main erosional event that shed coarser-grained

conglomerates known as molasse. Sedimentary structures in

flysch typically include a series of graded and cross-laminated

layers in sands forming Bouma sequences, indicating that the

sands were deposited by turbidity currents. Flysch is typically

deposited in foreland basins and forms regionally extensive

clastic wedges, underlain by distal black shales, and overlain

by fluvial deposits and conglomerates of fluvial origin.

See also MOLASSE; OROGENY; TURBIDITE.

Foehn winds See CHINOOK WINDS.

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