Alluvial Fan (Geoform Type)

Component: Geoform

Unique Identifier: 90

Geoform Origin	Geologic
Geoform	Fan
Geoform Type	Alluvial Fan

Description

Definition

A low, outspread, relatively flat (or gently sloping) mass of loose rock material, shaped like an open fan or a segment of a cone. The rock material was deposited by flowing water where it issues from a narrow valley or where the gradient abruptly changes. Alluvial fans are usually steeper than the surrounding surface.