A 3-D seismic image of Gulf Coast thin-bed fluvial channels. The data represent reflection amplitude values on a stratal surface that passes through the targeted thin-bed system. When a stratal surface is correctly defined, subtle stratigraphic features created at the depositional time represented by the stratal surface are often revealed with clarity, as in this example which shows a meandering channel system in the lower right quadrant of the image, and a narrow channel cutting across the upper right quadrant.