Fig. 4
From: Water on Mars: Do submarine cyclic steps exist on the red planet?
Structure of a typical deltaic deposit on Mars (modified from Di Achille and Hynek 2010). Schematic diagram illustrates a topset (also called delta plain), foreset (also called delta front), and bottomset deposit (also called delta base), as well as the foreset-bottomset transition. Under the right conditions, the foreset-bottomset transition generates submarine cyclic steps