A matter of supreme human interest in anthropology at the present time is the appearance of man in the successive stages of the geologic history of Eurasia and of Africa. The chief object of the present paper is to submit a summary and synthesis of the most recent interpretations in the European Quaternary, both in their bearing on the prehistory of man and as time standards of importance to students of American Pleistocene geology and physiography. The recent coordinations of Depéret have set a new basis of time division for the whole Quaternary. The researches of De Geer establish the past fifteen millennia. When combined they support, with certain modifications, the pioneer work of Penck and Bräckner. This paper opens with a review of the progress of opinion from 1901 to 1921; it presents a precise statement of Depéret’s contributions of . . .