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Asahi, H.,Kender, S.,Ikehara, M.,Sakamoto, T.,Takahashi, K.,Ravelo, A.C.,Alvarez Zarikian, C.A.,Khim, B.K.,Leng, M.J. Pergamon Press 2016 Deep-sea research. Part II, Topical studies in oce Vol.125 No.-
A continuous composite oxygen isotope (δ<SUP>18</SUP>O) stratigraphy from benthic foraminifera in the Bering Sea was reconstructed in order to provide insight into understanding sea-ice evolution in response to Northern Hemisphere Glaciation. Oxygen isotope records from multiple species of benthic foraminifera at Integrated Ocean Drilling Program (IODP) Expedition 323 Site U1343 (54<SUP>o</SUP>33.4'N, 176<SUP>o</SUP>49.0'E, water depth 1950m) yield a highly refined orbital-scale age model spanning the last 1.2Ma, and a refined age model between 1.2 and 2.4Ma. An inter-species calibration was used to define species offsets and to successfully obtain a continuous composite benthic δ<SUP>18</SUP>O record, correlated with the global composite benthic δ<SUP>18</SUP>O stack curve LR04 to construct an orbital-scale age model. The consistency of the benthic δ<SUP>18</SUP>O stratigraphy with biostratigraphy and magnetostratigraphy confirms the reliability of both methods for constraining age. The time difference between cyclic changes in sedimentary physical properties and glacial-interglacial cycles since 0.8Ma is notable, and suggests that physical properties alone cannot be used to construct an orbital-scale age model. Amplitude changes in physical properties and a significant drop in the linear sedimentation rate during glacials after 0.9Ma indicate that the glacial sea-ice edge extended beyond the Bering Sea Slope (Site U1343) at this time.