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Where were Homo habilis fossils discovered at Olduvai Gorge?

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Illustration showing side-by-side reconstructions of five hominins in the human lineage: Australopithecus afarensis, Homo habilis, Homo erectus, Homo neanderthalensis, and Homo sapiens, with each figure labeled and depicted in a walking pose to highlight evolutionary changes in posture and body structure. A scale bar at the top right indicates relative height. — human evolution An artist's depiction of five species of the human lineage.

Fossils of Homo habilis at Olduvai Gorge in Tanzania have been recovered from specific stratigraphic units, primarily Bed I and the lower portion of Bed II.1

The initial discovery of Homo habilis remains occurred in 1959 and 1960. These early finds, including the specimen known as OH 7, were located within the deposits of Bed I, which accumulated in a lake basin environment approximately 1.7 to 2.1 million years ago. Additional specimens discovered at the site include OH 13, OH 16, and OH 24 (also known as "Twiggy"), which were also recovered from these fossil-rich beds.213

Later, in 1986, the discovery of OH 62—a partial skeleton dated to approximately 1.8 million years ago—provided significant evidence regarding the body proportions of the species. Furthermore, Homo habilis remains have been identified in the lower one-third of Bed II, a layer that sits above Bed I and dates to between 1.15 and 1.7 million years ago.31