A preliminary assessment of the fluid erosional processes that shaped the Martian outflow channels.

Whatever process is invoked to explain the Martian outflow channels must also explain a distinctive assemblage of channel landforms: regional and local anastomosing patterns, expanding and contracting reaches associated with flow constrictions, streamlined uplands, inner channels with recessional headcuts, pendant forms (bars or erosional residuals) on the downcurrent sides of low obstacles, longitudinal grooves, irregular 'etched' zones on channel floors, and scour marks around obstacles. -from Author