Paleolithic remains, mostly surface finds from blowouts, are known from 63 sites in the Trans-Baikal, one of the five large regional subdivisions of the Siberian Paleolithic. Most important recent discoveries are the stratified sites of Oshurkovo and Sannyi Mys and the Pleistocene faunal sequence on Tologoi Mountain. Characteristic stone tools are made from whole or split pebbles and from blades removed from prismatic cores. Bone artifacts, known only from Oshurkovo, include slotted points and knives and flat antler harpoons. The Trans-Baikal finds, all Upper Paleolithic in time, are tentatively arranged in five chronological stages. The earliest period is based on the lower levels at Sannyi Mys in which microblades, but no pebble tools, are found with woolly rhinoceros and mammoth. The next period is represented by large pebble tools and cores from Ust"-Kiakhta Locality 3. Typical Siberian pebble tools found with horse in the upper levels at Sannyi Mys are assigned to the third stage. The fourth is best known from Oshurkovo where all the common Siberian Paleolithic stone tools are found along with bone artifacts in deposits which contain abundant fish bones. A number of sites are assigned to the fifth stage, but it is best represented by the uppermost level at Oshurkovo where flakes, flaked pebbles, and small blade tools of regular outline replace the large blades and pebble cores of the earlier periods. This tentative sequence is strengthened by correlations with the Angara and Yenisei areas to the west and with Mongolia and North China to the east. The Trans-Baikal is seen as an area in which the prismatic core and blade tradition of Eurafrican origin and the split pebble-tool tradition of eastern Asia were in contact from the earliest known period.