Prehistory of Kangleipak
Songbu cave - Discovered in 1983, the rock type was found to be of fine quartzite sandstone. Stone tools discovered here are of two types, core tools and flake tools. The quantity of the flake tools (77.7℅) is much higher than those of core tools (22.2℅). The period of the existence of the stone culture at Songbu cave is fixed at 20,000 BP, belonging to the middle Paleolithic period. At the time of exploration, the nine types of artifacts discovered are: (1) Flake - 1, (2) Knife - 1, (3) Blade Hake - 3, (4) Point - 1, (5) Borer scrapper - 1, (6) Hand axe - 1, (7) Spilt pebbles - 1.