Figure 2. Orthogonal seismic sections illustrating a Pleistocene shelf edge delta. The base of the prograding complex is shown as an illuminated surface. This basal surface is characterized by multiple gullies that likely formed at the onset of sea-level lowstand. Later in the development of this shelf-edge system, a single, larger slope channel replaced the multiple gullies as the dominant feature of the slope. The slope channel is about one mile wide and the slope gullies about 600 feet wide.