Rocks exposed in the walls of Grand Canyon testify of the advance of marine waters upon North America during the Flood. How rapid was the advance? What was it like? We may never fully know the answers but there are few places on earth that are better suited for study.

Geologists tend to be very provincial. Rarely do they stand back and look at "the whole canvas" of the sedimentary rock record. When they do, some remarkable things emerge. For example, consider the Tonto Group, a succession of three well-layered formations in the lower part of Grand Canyon.

Some people have an intellectual problem with the Flood because of mud cracks. We have all seen cracks that form in a dried (or "desiccated") mud puddle. But did you know mud cracks are also found in sedimentary rocks that are interpreted as Flood strata? Were there "droughts" during the Flood?