1915 graduated Petrograd Mining Institute.
Specialist in hist, geological, stratigraphy and paleontology. Main works deal with facies, statigraphy and paleography of Paleozoic in the Urals, Cis-Ural Area, Central Asia and Russ, platform. 1915, 1927 and 1932 participated in expeditions to the Pamir.
1921 carried out research in Central Asia and the Urals. 1933-1946 corresponding member, USSR Academy of Science. Since 1951 honorary member, Turkmenistan Academy of Sciences.
Chief Editor, geological survey maps of USSR. Editor, geological шар of world. Deputy, Leningrad City Soviet.
Deputy Chairman, Leningrad Oblast Committee of Peace Partisans. 1917-1949 associate, Geology Committee, now All-Union Geology Research Institute. 1946-1951 Chairman, Presidium, Turkmenistan Branch, USSR Academy of Science.
1946-1953 Director, Laboratory of Limnology, USSR Academy of Science.
Religion discourages exploration of science and universe by suppressing curiosity, and denies its followers a broader perspective.