A sediment core, collected from the western part of the continental slope of the Ross Sea at 2380 m water depth, records Ž . 230 events of the last two climatic cycles 250 kyr . A Th -based chronology was obtained and boundaries of the isotope ex stages were set assuming that biological productivity was enhanced during periods of less ice cover. Then, Th0 , organic ex carbon, biogenic silica an...
