Have you ever been "tongue-tied" when asked to provide geologic evidence that the Genesis Flood really did occur, just as the Bible describes? What follows is an overview of six geologic evidences for the Genesis Flood. Together, they will provide you with "ammunition" and a teaching tool for you and others. Why is it that many people, including many Christians, can't see the geologic evidence for the Genesis Flood? It is usually because they have bought into the evolutionary idea that "the present is the key to the past." They are convinced that, because today's geological processes are so slow, the earth's rock layers took millions of years to form.
However, if the Genesis Flood really occurred, what evidence would we look for? We read in Genesis 7 and 8 that "the fountains of the great deep" were broken up and poured out water from inside the earth for 150 days (5 months). Plus, it rained torrentially and globally for 40 days and nights. ("The floodgates [or windows] of heaven were opened.") No wonder all the high hills and the mountains were covered, meaning the earth was covered by a global ocean. ("... the world that then was, being overflowed with water, perished" 2 Peter 3:6; KJV.) All air-breathing life on the land was swept away and perished.
Wouldn't we expect to find billions of dead plants and animals buried and fossilized in sand, mud, and lime that were deposited rapidly by water in rock layers all over the earth? Of course! That’s exactly what we find. Indeed, based on the biblical description of the Flood, there are six main geologic evidences that testify to its historicity.
Evidence #1: Fossils of Sea Creatures High Above Sea Level
On every continent we find fossils of sea creatures in rock layers that today are high above sea level. For example, most of the rock layers in the walls of the Grand Canyon contain marine fossils. This includes the Kaibab Limestone at the top of the strata sequence and exposed at the rim of the canyon, which today is 7,000–8,000 feet above sea level. This limestone was therefore deposited beneath lime sediment-charged ocean waters, which swept over northern Arizona (and beyond). Other rock layers of the Grand Canyon also contain large numbers of marine fossils. The best example is the Redwall Limestone, which commonly contains fossil brachiopods (a type of clam), corals, bryozoans (lace corals), crinoids (sea-lilies), bivalves (other types of clams), gastropods (marine snails), trilobites, cephalopods, and even fish teeth.3 These marine fossils are found haphazardly preserved in this limestone bed. The crinoids, for example, are found with their columnals (disks), which in life are stacked on top of one another to make up their "stems," totally separated from one another in what can best be described as a "hash." Thus, these marine creatures were catastrophically destroyed and buried by the deposition of this lime sediment layer.