OLDUVAI GORGE--"This canyon in Tanganyika Territory in East Africa has yielded the most complete sequence of early human tools ever discovered, and along with these a great wealth of remains of the now extinct animals that Stone Age man hunted. In the successive deposits in the Gorge is written some 400,000 years of man's cultural history--from the Middle Pleistocene to about 15,000 years ago. They cover almost the whole span of man's hand-axe phase, known to archaeologists as the Chelles-Acheul culture. Olduvai Gorge, so rich in the relics of human settlements, seems an ideal place to look for the remains of hand-axe man himself. The conditions for fossilization of his bones there were excellent.