This geological feature retreats in a process known as transgression, and it can grow outward and upward in progradation and aggradation, respectively. This feature can be described as cuspate, arcuate, bird-foot, or estuarine. This is the equivalent of an alluvial fan located in water. These features are characterized by large drainage basins, which deposit sediment. For 10 points, name this geological feature that occurs when a river flows into a lake or ocean, which is named for the shape of 
This geological feature retreats in a process known as transgression, and it can grow outward and upward in progradation and aggradation, respectively. This feature can be described as cuspate, arcuate, bird-foot, or estuarine. This is the equivalent of an alluvial fan located in water. These features are characterized by large drainage basins, which deposit sediment. For 10 points, name this geological feature that occurs when a river flows into a lake or ocean, which is named for the shape of the Greek letter formed by the Nile one.
This geological feature retreats in a process known as transgression, and it can grow outward and upward in progradation and aggradation, respectively.
deltas