There are several studies regarding the number and size of animals required to repopulate the earth to the diversity we see today, and how they coul fit on the ark with room to spare. I could reccomended a couple, but you would dismiss them out of hand. Regardless, the best evidence for a global flood is the vast fossil beds found worldwide, and I am convinced only an event so cataclysmic can explain what we unearth.
Cœlacanth?............. When I was a kid, they found one in Madagascar, that was around 1948, a few years back they found another. Some ole fossils managed to stick around. (like me) Finding fish on a mountain range doesn’t necessarily mean a great flood, it could mean the ocean bottom was pushed up during the continental shifts. The Ark that is on display in Holland/Denmark?? which is a replica made from the biblical measurements would not be able to carry anything close to a pair of each mammal and reptile that may have been on the planet in Noah’s time. Of course God created everything and it was in his power to make all the animals shrink into 35MM miniature size, but I don’t believe that part is written anywhere. In all those fossils, where are all those humans that were drowned? (Rhet.) In all those biblical readings, did they realize that just over the horizon there were other civilizations that were not affected? Do we go onto to Jonah next? What difference does it make if it was 1 million or 100 million years ago? The dinosaurs were extinct, if they weren’t, mammals would be part of their menu, and we as humans can be thankful they weren’t around. They have enough problems dealing with Crocodiles in the Nile Region, just think what it would be like, having to run and hide from roving raptors and Tyrannosauruses higher than your average house.