When compared to our world, Earth would be roughly 20 degrees Celsius (36 °F) hotter during summer. It would also experience massive typhoons due to the enormous circulation system in the Tethys that would be unimpeded except by island chains or shallow continental shelves.
During the second historical Pangaean period, mammals dominated in tropical and water-rich monsoon areas while reptiles dominated the great arid areas, largely because mammals use more water when they excrete. Studies of a transection of Pangaean fossil records show tropical regions dominated by traversodont cynodonts, an extinct order of pre-mammals, while the temperate regions were largely occupied by procolophonoids, which resembled stocky lizards and are distantly related to modern turtles.
Different regions of a modern Pangaea might have been dominated by completely different orders of life, a variety of tropical mammal and mammal-like creatures populating the hot and wet regions, and reptiles and pseudoreptiles ruling the roost in the dry interior and temperate regions. Intelligent life would have been unlikely to develop due to the relative stasis of the environment, but if it had, its effect on the opposite climatic region would have been dire. --
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Topic: What If Pangaea Had Never Broken Up? (Read 1091 times)