Answer
Zinjanthropus skull, discovered by Mary Leakey at Olduvai Gorge, Tanzania, in 1959, was a significant find that contributed to our understanding of human evolution. The skull, belonging to a species named Australopithecus boisei, provided evidence of an early hominin with a large braincase and robust facial features. This discovery challenged the prevailing view that Homo habilis was the earliest known hominin and suggested a more complex evolutionary history.