Laetoli is a site in Tanzania, dated to the PlioPleistocene. It is famous for its hominin footprints, preserved in volcanic ash. The site of the Laetoli footprints is 45 km south of Olduvai gorge. It was excavated by archaeologists Louis and Mary Leakey in 1978. “The Laetoli Footprints” got a lot of attention from the public because they are convincing evidence of bipedalism in Pliocene hominins.