 Then it moves shoreward by wind-driven, tidal or estuarine-like circulation, and is deposited thanks to the stabilization of marine plants and animals.Since many times the open marine source areas are larger than the nearshore traps, due to the lack of accommodation space, the sediments' wedge inevitably progradates seaward.This seaward progradation gives a regressive cycle from open marine shelf or platform to supratidal flat.