Looking for flood lines in strata at every level would be quite silly.. overlooking the intent of the scripture and missing "the point".... only to make a reverse point.. in error..
Really?
Then the flood came upon the earth for forty days, and the water increased and lifted up the ark, so that it rose above the earth. The water prevailed and increased greatly upon the earth, and the ark floated on the surface of the water. The water prevailed more and more upon the earth, so that all the high mountains everywhere under the heavens were covered. The water prevailed fifteen cubits higher, and the mountains were covered.All flesh that moved on the earth perished, birds and cattle and beasts and every swarming thing that swarms upon the earth, and all mankind; of all that was on the dry land, all in whose nostrils was the breath of the spirit of life, died.
Thus He blotted out every living thing that was upon the face of the land, from man to animals to creeping things and to birds of the sky, and they were blotted out from the earth; and only Noah was left, together with those that were with him in the ark.
Genesis 7:17-23
Looks pretty explicit to me. All the earth was covered, everything died, the only things left alive were the creatures on the Ark.
The results from a flood can kill living things far beyond the actually flooded areas.. Food chain disruption can exterminate.. We'll all see that when the muzzies start nuking American cities.. When "Mad MAx" mentality become entreanched.. Hopefully not SOON..