Crucial Boundaries in the Development of the Late Cretaceous Biota of Planktonic Foraminifera in the Southern Indian Ocean

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The article analyzes the author’s own data on the species composition of planktonic foraminifera tests from Upper Cretaceous sediments in the Indian Ocean, as well as from sections of the marginal shelf seas of Australia. Planktonic foraminifera species are grouped and arranged into a climate series. Analysis of the change in the systematic composition of foraminifera made it possible to identify periods of extreme and intermediate climatic conditions in the Late Cretaceous.