The “picture” that must match in the “continental drift
puzzle” is one of rock types and geologic features such as
mountain belts. If the continents were together, the rocks
found in a particular region on one continent should closely
match in age and type those found in adjacent positions
on the once adjoining continent. Wegener found evidence
of 2.2-billion-year-old igneous rocks in Brazil that closely
resembled similarly aged rocks in Africa.