Not a half bad idea, the difficult part would be the impassibles, or easy part if you're creative enough to take liberty in the fact that we don't exactly know where the mountains, rivers, deserts were 220 million years ago (although science gives a good estimation of where they should be... in theory) There was a time travel map that used Pangaea as a part of the map... lemme find it.
Time and Place map There should be a Pangaea Ultima (Earth +250 million years) map floating around in the recycling bin too.
I think this idea has been suggested a couple of times and tried once or twice. Pangaea tends to fall into the category of maps that have been tried that just don't even seem to make it very far, like Mars and the Moon...
I myself keep toying around with ideas for maps once I'm done, or nearly done with
Japan one of them was a map of Earth at the end of the Cretaceous, 65 million years ago. I thought the shape of the continents would be very recognizable and would be different enough to keep the Hasbro legal group away...
