Fossilization is a rare event, especially of humans who are very mobile. Since the rains of Noah’s Flood took weeks to cover the earth, many people could have made it to boats, grabbed on to floating debris, and so on. Some may have made it to higher ground. Although they wouldn’t have lasted that long and would have eventually perished, they might not fossilize.

In most cases, dead things decompose or get eaten. They just disappear and nothing is left. The 2004 tsunami in Southeast Asia was a shocking reminder of the speed with which water and other forces can eliminate all trace of bodies, even when we know where to look. According to the United Nation’s Office of the Special Envoy for Tsunami Recovery, nearly 43,000 tsunami victims were never found.

Even if rare, it would still be possible to fossilize a human body. In fact, we do find fossils of humans, such as Neanderthals, in the post-Flood sediments.