The first study by Kh.Perlee in 1943 triggered off annual expeditions in 1960-1980. A research work on seal imprints of Rashaan Khad was produced. A research on the Bronze Age initiated in 1973-1974 by “Gurvan Gol” expedition group, but beginning from 1980-1981 Mongol-Soviet joint expedition continued the work. During the last expedition it was proved that the settlement had 4 layers which are 2,5-3,5m in depth and about 2500 stone tools, bones of several types of animals were found. The most significant find among them was a tusk of rhinoceros. People of the Paleolithic Era who lived around the Khentii range and Rashaan Khad had been making various flint tools in order to hunt a koulan, a mammoth and a rhino. This ancient lifestyle was depicted on the rock.

15000-8000 years ahead of time Central Asian climate changed dramatically and huge animals began to die out. This forced primitive people to hunt quicker and smaller animals. So, they came up with bow and arrow best fit to hunt these animals. During this period people also began to move or migrate more often. Stone tools of particular period which were found in Mongolia, especially those called Goviin Uldets by scholars, were also found in Siberia, Far East, North China, Korea, Hokkaido of Japan as well as Alyeska of USA.