With the land mass all in one place at the time of the flood and then being divided as it is today what would you expect to find in your search for a global flood?
Ocean-laid sediments worldwide, all of the same Fludde age, that included human fossils or artifacts. It would, of necessity, be young enough sediment to include humans, as the Fludde was designed to wash them away.
You would also expect to find evidence of continents scooting around in Peleg's Days, say 5000 years ago or so. Evidence like, perhaps, the entire crust of the earth still being molten, and the sediments mentioned above still being lava instead of sediment.
"The wretched world lies now under the tyranny of foolishness; things are believed by Christians of such absurdity as no one ever could aforetime induce the heathen to believe." - Agobard of Lyons,
ca. 830 AD