Given a surface area of the earth of around 197,000,000 square miles, make an assumption of the population of the earth at the time of the Flood and divide that number by 197,000,000. This is a starting point to seeing how scarcely populated the post flood sediment would be for dead human beings per square mile.
Next assume fossilized remains do not happen for each and every dead creature, including humans. The per square mile density of potential fossils shrinks even more.
Assuming a billion people existed at the time of the flood yields only about 5 potential human fossils per square mile. In other words, go to a 640 acre plot of land (1 square mile) and find 5 dead human bodies buried there, possibly very deeply, too. Even at 20 billion people, that is still only 20 dead human bodies, and assuming fossilization took place in every instance (it would not), and whole human bodies, not just parts, were fossilized.
Given this, absence of evidence is no claim to evidence of absence to be used to discount the young earth view from Scripture.
AMR