NATIONAL GEOGRAPHIC SOCIETY / SMITHSONIAN INSTITUTION / SCIENCE PHOTO LIBRARY NATIONAL GEOGRAPHIC SOCIETY / SMITHSONIAN INSTITUTION / SCIENCE PHOTO LIBRARY
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Louis Seymour Bazett Leakey (1903-1972) and his wife Mary Douglas Nicol Leakey (1913-1996), British archaeologists and palaeoanthropologists, excavating a site at Oduvai Gorge, Tanzania. The Leakeys made a number of significant discoveries in Olduvai Gorge. In 1959 Mary found a fossil skull of Paranthropus boisei (formerly Australopithecus and Zinjanthropus boisei) that was 1.75 million years old. They also discovered stone tools, the remains of Homo habilis and the Laetoli footprint trail that showed that hominids had acquired a bipedal gait by 3.6 million years ago.
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