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This paper reviews significant issues related to the fossil hominins from the Altai Mountains of Siberia (Russia), namely Denisovans, Neanderthals, and early modern humans. Uncritical acceptance of the recovered information by some authors has resulted in unreliable chronologies of the Middle and Upper Paleolithic artifact assemblages and the animal and hominin fossils. We examine the chronostratigraphic contexts and archaeological associations of hominin and animal fossils and the lithics discovered at the Denisova, Okladnikov, Strashnaya, and Chagyrskaya cave sites. Taphonomic, site formation, and geomorphological studies show evidence of disturbance and redeposition caused by carnivore activity and sediment subsidence at these sites, which complicates the dating of the human remains. Our analysis indicates that the Middle Paleolithic is dated to ca. 50,000–130,000 years ago, and the Upper Paleolithic to ca. 12,000–48,000 years ago. The best age estimate for Denisovans is ca. 73,000–130,000 years ago. The ages of Neanderthals can be determined as more than 50,000–59,000 years ago, and of modern humans at roughly 12,000–48,000 years ago. Denisovan and Neanderthal fossils are associated with Middle Paleolithic complexes only.

We present an analysis and interpretation of current knowledge on Paleolithic diet in Siberia and Eastern Europe, based on C and N stable isotope ratios in bone collagen of the pre-Last Glacial Maximum (LGM) and LGM hominins: three Neanderthals; one possible Denisovan; a Neanderthal/Denisovan hybrid; and 13 early anatomically modern humans (AMH). We used animal stable isotope information for Siberia obtained previously to establish the baselines for hominins; this is supplemented by stable isotope values for large mammals from the central West Siberian Lowland which were the probable sources of protein for Paleolithic humans in this region (first of all, the oldest directly radiocarbon-dated Ust’-Ishim AMH in Asia). A comparison of results on Paleolithic hominin diet from Siberia and Eastern Europe with Central Europe was also undertaken. The Neanderthal diet in Siberia was based on the consumption of terrestrial animal protein. As for the Neanderthal/Denisovan hybrid from Denisova Cave (Altai Mountains, southern Siberia), the contribution of aquatic food like freshwater fish can be preliminarily suggested. Overall, Paleolithic AMHs in Siberia and Eastern Europe procured mainly terrestrial herbivores—in particular, reindeer, horse, and bison. It is possible that some of the oldest AMH individuals—like Kostenki 1—supplemented their diet with a certain amount of aquatic food (freshwater fish).

Basic data on the geology and geochemistry of obsidian from the Lake Krasnoe source in Chukotka (Northeastern Siberia) are reported for the first time. The data are based on 2009 fieldwork and analytical studies of igneous rock samples. The lake shore and surrounding parts of the Rarytkin Range were thoroughly examined. Two geochemical types of rhyolitic obsidian were recognized for the first time: (1) metaluminous obsidian related to the fine-grained crystalline rocks and (2) peralkaline obsidian corresponding to ignimbrite ash-flows or lapilli-tuffs composition. Both types are related to the final phase of acidic volcanism in the Western Kamchatkan-Koryak Volcanic Belt. Based on the results obtained, we conclude that accumulation of obsidian pebbles in the lake’s modern beach deposits is related to silicic melts that erupted during the late Eocene-early Oligocene in the form of extrusive domes or pyroclastic flows, which are now either covered by Quaternary sediments or located below the water level. The Lake Krasnoe obsidian was intensively used by the ancient populations of Chukotka as a raw material for making stone tools. It was also occasionally transported to Alaska across the Bering Strait in later prehistory. The distances between source and utilization sites are up to 700–1100 km. Geochemical data for Lake Krasnoe obsidian, based on neutron activation analysis and X-ray fluorescence that are presented here, can now be used for provenance studies in the Northeastern Siberia and adjacent regions of northern North America.

This article focuses on the presence of humans in Siberia and the Russian Far East at the coldest time of the Late Pleistocene, called the Last Glacial Maximum (LGM) and dated to c. 20,000–18,000 rcbp. Reconstruction of the LGM environment of Siberia, based on the latest models and compilations, provides a background for human existence in this region. Most of Siberia and the Russian Far East at c. 20,000–18,000 rcbp was covered by tundra and cool steppe, with some forest formations in the river valleys. Climate was much colder and drier than it is today. Eighteen Upper Paleolithic sites in Siberia are radiocarbon dated strictly to the LGM, and at least six of them, located in southern parts of western and eastern Siberia and the Russian Far East, have solid evidence of occupation during that time span. It seems clear that southern Siberia was populated by humans even at the height of the LGM, and that there was no dramatic decline or complete disappearance of humans in Siberia at that time. The degree of human adaptation to periglacial landscapes in the mid-Upper Paleolithic of northern Eurasia was quite high; humans coped with the cold and dry environmental conditions using microblade technology, artificial shelters, tailored clothes, and megafaunal bones as fuel.

We have compiled 462 C-14 determinations for 120 Paleolithic and Mesolithic sites from Siberia and the Russian Far East. The Mousterian sites are dated to ca. 46,000–28,500 BP. The Middle–Upper Paleolithic transition dates to ca. 43,300–28,500 BP. Although there are a few earlier sites, most of the Upper Paleolithic sites are dated to the time interval between ca. 34,000 BP and 10,000 BP. The earlier Upper Paleolithic stage is characterized by macroblade technology and is radiocarbon-dated to ca. 34,000–20,000 BP. The earliest microblade technology occurs in the late stage of the Upper Paleolithic, dated to ca. 23,000–20,000 BP, but the majority of microblade sites is dated to ca. 20,000–11,000 BP. The Final Paleolithic (Mesolithic) sites date to ca. 12,000–6000 BP. At ca. 13,000–11,000 BP, the earliest Neolithic appeared in both the Russian Far East (Amur River basin) and the Transbaikal. The Paleolithic–Neolithic transition occurred ca. 13,000–6000 BP.