Cut stones dated about 3 million years old have been collected in the area of Lake Abbe. In the Gobaad plain (between Dikhil and Lake Abbe), the remains of a Palaeoloxodon recki elephant were also discovered, visibly butchered using basalt tools found nearby. These remains would date from 1.4 million years BCE. Subsequently, other similar sites were identified as probably the work of Homo ergaster. An Acheulean site (from 800,000 to 400,000 years BCE), where stone was cut, was excavated in the 1990s, in Gombourta, between Damerdjog and Loyada, 15 km south of Djibouti City. Finally, in Gobaad, a Homo erectus jaw was found, dating from 100,000 BCE. On Devil's Island, tools dating back 6,000 years have been found, which were used to open shells. In the area at the bottom of Goubet (Dankalélo, not far from Devil's Island), circular stone structures and fragments of painted pottery have also been discovered. Previous investigators have also reported a fragmentary maxilla, attributed to an older form of Homo sapiens and dated to ~250 Ka, from the valley of the Dagadlé Wadi.