In the Grand Canyon, there are layers upon layers of fossils. You don't see any of these fossil layers overlapping or mixing together. They are very distinct. If there was a great flood, you would expect these animals to swim up, towards the surface. But you don't see that, you see that they are settled very specifically. Pangea is a very well supported idea. I don't doubt Pangea at all. Those fossils could just be the remains from millions of years ago, before those mountains gained height due to plate tectonics. They could have been underwater and fish died there before the mountains rose. The collision with Asia and India, which sparked the Himalayas is known to have happened only 55 million years ago, sea life was abundant at that time period.