M.G. Levin, "Ethnic Origins of the Peoples of Northeastern Asia," Arctic Institute of North America, Anthropology of the North: Translations from Russian Sources/No.3, 1963
"The Uralian race combines Europoid [Caucasoid] and Mongoloid traits and originated from the mixing of types of the Europoid and the Mongoloid major races. Its formation dates to an early period during which the forest belt of western Siberia and of adjacent eastern Europe was first peopled. During the long period that followed, different variants with transitory morphological characteristics formed."
M. G. Levin, "The Anthropological Types of Siberia," in The Peoples of Siberia, ed. M. G. Levin and L. P. Potapov, The University of Chicago Press, 1964
"In the preceding chapter we adduced data on the anthropological composition of the ancient population of Siberia, which can be summed up in the following way. Judging by the material available, which, admittedly, is still very sparse, during the Upper Paleolithic Siberia was populated by Mongoloid groups. We do not yet possess sufficient data to define the limits within which the Mongoloids spread during this period, or to trace how far west the settlement of the Mongoloid-type paleolithic population extended. Future researches will have to ascertain whethere or not this region covered southwest Siberia as well during that period, or whether the original settledment of that territory, just as in the vast spaces to the west of the Yenisey, was due to the advance of Europeoid groups from the southwest and west."
"In any case, the region west of the Yenisey had long been the scene of intermingling between Europeoid and Mongoloid types. The latter penetrated far into Eastern Europe. In the Neolithic and eneolithic periods, the demarcation between Mongoloids and Europeoids in Siberia can be traced fairly clearly. The population of the forest belt at this time, to judge by paleo-anthropological material, has clearly marked traits of the great Mongoloid race."
"During this period the Altay-Sayan Plateau was settled by Europeoids; the anthropological type of the population, which left behind relics of the Afanas'yevo and Andronovian cultures, need give rise to no doubt."
"The Europeoid groups occupied the steppes of the Altay and Minusinskiy Kray, while the forest belt both in eastern and western Siberia continued to be extensively occupied by Mongoloid types. The boundary between them was by no means permanent. From the Altay-Sayan steppes the Europeoid groups seem to have moved fairly far east; the neolithic population west of Lake Baykal, in particular, shows a Europeoid admixture. In their turn, the Mongoloid elements penetrated into the steppe regions."
"From then on the proportion of the various Mongoloid types among the population of southwest Siberia kept increasing. This was particularly the case during the Tashtyk period. At the end of the first and beginning of the second millennia A.D., in the Altay-Sayan Plateau, too, Mongoloid-type groups almost completely ousted the ancient Europeoid population."