The second part of the Stone Age in sub-Saharan Africa, dating from c 150,000-30,000 years ago and roughly equivalent to the Middle Palaeolithic elsewhere in the Old World. Assemblages are characterized by flakes made by preparing the core; there were many shapes and sizes of these artifacts. The characteristic tools are made on flakes produced by a developed Levalloisian technique, including slender unifacial and bifacial lances or spear points for stabbing or throwing. In the final stages of the Middle Stone Age, known as the South African Magosian, microlithic elements appear. Middle Stone Age assemblages are associated with anatomically modern Homo sapiens in southern Africa. People continued to live in open camps, while rock overhangs also were used for shelter. Middle Stone Age bands hunted medium-size and large prey. Sometimes they collected tortoises and ostrich eggs in large quantities, as well as seabirds and marine mammals that could be found along the shore. The rich archaeological deposits of Klasies River Mouth Cave preserve the earliest evidence in the world for the use of shellfish as a food source.