First of all there are mammals found in permafrost from 10,000 years ago, 20,000 years and even 40,000 years.
So it's obvious that this happens regardless of a flood.
Even if we had no explanation we don't look to Greek myths, Hindu creation stories or Israelite myths to find answers to what happened in the past. They are myths. Every culture has similar myths and none are actual things that happened in history.
Again, Noah's Ark is a direct copy of the Mesopotamian flood myth from way before the Israelites were a people.
There is no argument based on assumptions of creationism, that is a fiction you have made up or read about on a creationist site.
Science does work based on evidence. Modern geology studies flood related science by looking at erosion,
Geochronology, geochemistry, rock features and many other properties that can be studied. None of these are making assumptions about creationism because they do not care. They only care about what the evidence is showing.
But even if we do not have any science that shows we did or did not have a worldwide flood this does not matter because the flood myth (and all world flood myths) are fictional stories. We don't study mountaintops to see which one Zeus probably lived on or study lightning to understand Zeus powers.
Your flood story is a copy-cat myth in a bunch of other stories that we know did not happen. In the 1970's Thomas Thompson's PhD work was accepted into the archeology field and considered the consensus. He proved that Moses and the Patriarchs were a myth.
Archeologists will confirm Exodus is a myth, the OT is not even written as history and it gets much worse for the NT.
So looking for science in Greek Epics or Israelite myths is a dead end. The OT is just a collection of Mesopotamian myths and then Persian myths were added in the 2nd temple period which influenced Christianity.