There is also the issue of depth. A flood that covers the earth will have a major effect and one that will also leave very easily recognized evidence.
For example, even if what some YECs and others who believe in the Biblical Flood are right and there were no high mountain ranges at the time, there would still be hills of some hundreds of feet in height. There was still land, and water did run off so there was some variation in land topography.
If you add a water column even just a few hundred feet high you totally change the ecology of the sea floor. What was once at a depth of 60 feet will now be at a depth of several hundred feet, and as anyone who dives knows, the ecology at 60 feet is entirely different than that at 260 feet.
But we stray from the topic.
To return towards that, I have a question.
Folk have said that the main water supply was rain water.
IIRC the order of the Biblical event was lots of rain at the beginning, along with one bodacious storm. That was followed by a much longer period where they floated around while the water supposedly ran off.
So here are the questions.
- how much water must be stored to last 8 humans and an unknown number of critters for the long post rain period?
- where did the water run off to?
Aslan is not a Tame Lion