Mudflow at the confluence of Kanab Canyon and Modred Abyss. Grand Canyon National Park, Coconino County, Arizona. Circa 1966.

Album caption and index card: Mudflow at the confluence of Kanab Canyon and Modred Abyss. Mudflow debris near the mouth of Kanab Canyon. The light-colored or clear boulders were cleaned by streamflow that occurred after the mudflow event. The log in the middle foreground was carried by the mudflow. The mudflow is concave upward and forms a notch or channellike feature that was downcut only slightly by the streamflow. Note lateral extent of mudflow. Grand Canyon National Park, Coconino County, Arizona. ca. 1966. Published as Figure 39-E in U.S. Geological Survey. Professional Paper 980. 1977.