Environmental Evolution of the Southern Chukchi Sea
in the Holocene

E. A. Gusev^a, N. Yu. Anikina^b, L. G. Derevyanko^b, T. S. Klyuvitkina^c, L. V. Polyak^d, E. I.
Polyakova^c, P. V. Rekant^a, and A. Yu. Stepanova^e

^a All-Russian Research Institute of Geology and Mineral Resources of the World Ocean (VNIIOkeangeologiya), St. Petersburg,
Russia

e-mail: gus-evgeny@yandex.ru

^b Central Geological–Prospecting Laboratory, Syktyvkar, Russia

^c Geographical Department, Moscow State University, Moscow, Russia

^d University of Ohio, Ohio, United States

^e Paleontological Institute, Russian Academy of Sciences, Moscow, Russia

Received July 24, 2012; in final form, March 19, 2013

Abstract—The molluscan shells from three drill and two piston cores obtained in the southern Russian sector
of the Chukchi Sea are dated by the AMS ¹⁴C measurement method back to 0.8–3.5 and 9.2–10.5 ka. The period
of 9–10 ka was marked by increased sedimentation rates related to the transgression onset. The fossils in the
lower Holocene section exhibit the successive upward replacement of brackish-water organisms by their marine
counterparts. After the opening of the Bering Strait in the middle Holocene, the sedimentation was under influ-
ence of the increased bioproductivity of the waters. The climatic optimum in the Chukotka region corresponds
to the early Holocene, while the late Holocene was characterized by the wider development of the ice cover on
the shelf.

DOI: 10.1134/S0001437014030011

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