jigsaw-puzzle fit of continents bordering the Atlantic Ocean is a feature noted
by scientists since the seventeenth century. Alfred Wegener called this supercontinent
Pangaea and cited as additional evidence the similarity of geologic features on
opposite sides of the Atlantic. The matchup of ancient crystalline rocks is shown
by orange in adjacent regions of South America and Africa and of North America
and Europe. (Geographic fit from data of E.C. Bullard; geological data from P.