(from the article `geosyncline`) ...volcanic sequences, together with graywackes (sandstones rich in rock fragments with a muddy matrix), cherts, and various sediments reflecting ...
The seaward part of a geosyncline
A geosyncline situated seaward from a continent and characterized by sediments deposited by turbidity currents and derived in part from a volcanic arc.
The seaward part of a geosyncline; characterized by clastic sediments and volcanism.
a former marine zone, bordering an ocean basin, marked by very thick deposits of sediment in which the products of volcanic activity are associated with clastic sediments.