Before revision: Proposed mechanisms of formation include: Lateral planation or erosion by a stream Sheetwash or sheet erosion, in which broad sheets of flowing water evenly remove thin layers of surface material without channel formnation .Wilson, William E. (editor) (1998) Glossary of Hydrology, American Geological Institute Rillwash or rill erosion :
After revision: Proposed mechanisms of formation include: Lateral planation or erosion by a stream Sheetwash or sheet erosion, in which broad sheets of flowing water evenly remove thin layers of surface material without incising channels .Wilson, William E. (editor) (1998) Glossary of Hydrology, American Geological Institute Rillwash or rill erosion , in which flow is concentrated in numerous closely spaced minute channels.Mountain-front retreating by weathering Lateral planation or erosion by a stream