Figure 3. Perspective view of a basin-floor leveed channel from the Gulf of Mexico. The channel is about one-half mile wide. Where the channel displays a convex-up cross profile, it is inferred to be sand-filled; where it is concave-up it is inferred to be mud-filled. Two avulsion nodes are seen where younger flows cut through the levee walls to form new channels in the overbank area. These avulsion channels typically are mud-filled and incise into the earlier-formed sand-filled channels.