The process of occupation of Eurasia by ancient populations was lengthy and difficult. New territories were gradually occupied by humans; changes in ecological conditions led to reverse migrations. The earliest sites in the Near East – Erk-el-Akhmar with the Oldowan industry are dated to the period between 2 to 1.7 Ma BP (Ron, Levi, 2001) and the Evron site is dated to over 1.5 Ma BP (Ronen, 1999) (Fig. 3).