close this window

Tillite

Geologists have found tillites—rocks formed from the deposits of ancient glaciers—in Antarctic soil. These rock deposits, which date from roughly 286 million years ago, bear a strong similarity to deposits found in other southern continents, such as Africa.

tillite
Photo: © Dr. John C. Crowell


This tillite from the African coast dates from roughly 250 million years ago, when South Africa was part of Gondwanaland.