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Archaeological research in Morocco over the past several decades has demonstrated a long occupation there by various hominid populations. The earliest industries are characteristic of what is called the Acheulian (ca. 1.5 million years ago to 250,000 years ago), which is composed of several types of bifacially-worked stone tools (handaxes) as well as many kinds of unifacial flake tools (Biberson 1967). The Acheulian, which is associated with hominids of the Homo erectus grade (H. ergaster, H. antecessor, H. heidelbergensis), represents the first colonization of hominids out of Africa.