There is no way that sea fossils can be found on the peaks of mountains if a global flood occurred. Unless the water was something like twice the height of the mountains, which is physically impossible anyhow, the global flood would have tended to wash away all forms of sediment to the bottom of mountains as it rose, and again when it rushed off (to wherever that may be). That type of hydrological action is going to wash all sediments to deposits at the lowest point of local elevation. If a global flood occurred, we should see piles and piles of mixed fossils in great deposits of local low elevation, and only that type of fossil. Instead, we have a very specific types of marine fossils that is found on solid rock on the tops of mountains. No T-Rex fossils, no human fossils, no coprolites. A global flood would never fossilize things at its surface.
On the other hand, fossilization under the ocean combined with plate tectonics does produce fossils on mountains.
I don't know of any relevant information about your lava claim (Did he happen to find an ark while he was up there?) but polar ice caps would have broken apart in a global flood and would not have reformed in tens thousands of years.