A fellow member of the Affiliation of Christian Geologists recently sent out a great photo of sediments deposited by a debris flow on the White River, near Mt. Hood in Oregon in November. The deposit here is up to 20 feet (6-7 meters) thick.

Photo by Doug Jones, USFS

A debris flow is a mixture of mud, rock, and or ash; with varying amounts of water. These often have the consistency of wet concrete, and form when heavy precipitation falls on easily eroded material.

Oregonian article on White River debris flows.

Debris flow movie (15 MB)

Another debris flow movie (3 MB)

Grace and Peace