Archaeologists consider stone hand axes the main innovation of the Acheulean industry, a tool tradition that emerged roughly 1.7 million years ago. “We believe that the Olduvai bone tools ...

An assemblage of tools found in Tanzania that was fashioned about 1.5 million years ago from the limb bones of elephants and hippos reveals what scientists are calling a technological breakthrough ...

Tools made from elephant bones range from 8.6 to 15 inches (22 to 38 centimeters) long, while the hippo bone tools are slightly shorter at 7 to 11.8 inches (18 to 30 cm) long.

Made out of an elephant bone, the tool dates to between 1.3 and 1.6 million years ago. Per Science News, it displays less intricate craftsmanship than the ax found at Konso.