History of a Foreland Basin
By Stage III the basin has undergone rapid subsidence, although it will continue to subside slowly. The water is very deep and in the deeper portions black shales continue to accumulate. The mountain is raised substantially, and large volumes of sediment avalanche into the basin as turbidity currents and begin to build a submarine fans.
At this stage the depositional environments are in a short system; that is, a high mountain right next to a deep water basin so that the only depositional environments present are proximal alluvial fans/braided rivers near the mountain dumping almost directly into submarine fans, skipping the intermediate meandering river, shoreline,
and shelf environments.
On To Next Stage
Monday, September 29, 2014