Micropaleontological Markers for the Stratigraphy of Upper Pleistocene–Holocene Deposits in the Southeastern Part of the Sea of Okhotsk (Based on Radiolarian Analysis)

The distribution of radiolarians in core LV76-9-1 (southeastern part of the Sea of Okhotsk) is studied. Based on a developed age model of the core, we established the biostratigraphic levels of some key radiolarian species and correlated them with the central part of the Sea of Okhotsk. Changes in the qualitative and quantitative characteristics of radiolarians are recorded during marine isotope stages 5–1. The species Lychnocanoma sakaii Morley et Nigrini, 1995, Cycladophora davisiana Ehrenberg, 1861, and Cerathospyris borealis Bailey, 1856, which are predominant in the Sea of Okhotsk, are divided into morphological forms, and the concentrations of these forms in deposits over the past 122 kyr are established.