It is showing the most populated areas at that time range
B. Two continental plates colliding
Fossil records from separate continents, particularly on the outskirts of continents show the same species. As well mineral specimens along the supposed break lines of the continents are nearly identical. Some identical species exist on certain continents, like an earthworm common to both Africa and South America suggesting the species could not have spontaneously arisen on both continents without some variations.
Many deserts seperate different countries as well as mountain ranges that cut off middle east from southwest Asia.
