It may come as a surprise to some, but not all rock layers were laid down during Noah's Flood. In fact, the evidence indicates that more geologic layers may have been formed during Day Three of Creation Week than during the Flood. What Do the Scriptures Tell Us?
The opening verses of Genesis 1 tell us that at the beginning, on the first day, God created the earth with water on its surface. We are not told what was under the surface water. Perhaps God had created the earth's internal structure of core, mantle, and crust, which were located under the water. What we do know is that on the second day God placed some of the waters of the earth above "the firmament." Then on the third day God commanded the earth's surface waters to be gathered into seas and the dry land to appear.
This statement in Genesis 1:9 is simple yet geologically profound. Although the verse indicates that the water moved, it does not indicate exactly how the land came to be above sea level. One possibility is that God used catastrophic earth movements to almost instantaneously raise and lower blocks of the earth's Day One crust to form dry land and sea basins. If that were so, as the crustal blocks were raised, the surface waters that had been covering them would have drained rapidly off the land. Rapidly moving water catastrophically erodes, so massive erosion must have occurred. Thus laden with sediments, these waters would have drained into the ocean basins, where the sediments would have been deposited rapidly. Because neither plant nor animal life had yet been created, the resultant sedimentary rocks would be devoid of animal or plant fossils.
[Read the rest of the article at Answers in Genesis.]