On the to Awash and other lowland steep slopes numerous fossils were discovered. Their age could be reliably dated, as it was repeated volcanic eruptions in this region and serve they left behind ash layers as a marker. For example, there is at the site of the 1974 discovered by Donald Johanson, Lucy (2.95 mya ) 3.18 mya, mya and 3.4 mya 3.22 old ash layers.
In the near Hadar numerous other hominid fossils have been found, among other things, the fossil Ardi ( Ardipithecus ramidus, a female, 4.4 mya ) and at the reference DRP which is particularly well-preserved fossil DIK 1-1 (a very well-preserved juvenile, female Australopithecus afarensis, 3.3 mya ), and also the oldest so far discovered stone tools. Therefore, the area is considered one of the birthplaces of mankind.