Nongpok Keithel Manbi and Singtom. 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. Khangkhui cave - Located in Ukhrul district, the rock type found is of limestone Cretaceous origin. Discovered in 1969, there are four caves in the Khangkhui, two on the western slopes and two on the eastern slopes. Cave number 1 and 2 are on the western and number 3 and 4 on the eastern slopes. Numerous stalactites are found hanging on the roof of the cave. Exploratory work started in 1969-1972 but was abruptly stopped due to unfavorable circumstances. The tools discovered are of two types, limestone tools (96.4℅) and sandstone tools (2.2℅). Bone tools were significantly found in the cave no. 3, especially of Cervus, Sus and Bonvines. Though some suggest that the age of the earliest existence of the stone culture at the Khangkhui to be around 15,000 BC, T.C. Sharma opined it to be around 30,000 BCE, belonging to the Upper or Late Paleolithic period. Nongpok Keithelmanbi - Discovered the stone culture in 1982–1984, the Nongpok Keithelmanbi is an archeological site of Paleolithic period and post Paleolithic period (Mesolithic period). The exploration site was classified into Locality-1 (Mesolithic), Locality-2 (Paleolithic) and Locality-3 (Paleolithic). The site is estimated to be of Upper or Late Paleolithic period. Most artifacts are made of Quartzitic sandstone pebbles and few of chert. Singtom - Discovered in 1989 in Chandel district of Manipur, 16 stone tools relics are collected from the site. These are (1) hand axe, (2) work flat pebble with round edge, (3) flaked pebbles, (4) blade, (5) flake, (6) pebble striker, (7) split pebble, (8) waste flake. All these are made up of Quartzitic sandstone. Machi - Discovered in 1974 in Chandel district and Tengnoupal district of Manipur, this archeological site dates