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Quaternary. The stratigraphy, magnetostratigraphy, petrography, chemistry and fossil content of the layers and their close correlation with results from deep-sea cores permit reconstruction of varying paleoenv2ronments and paleoclimates. The chronology of these changes indicates major oscillations with periods of 80,000, 40,000 and 20,000 years, with a possible return to glacial climates in another 5,000 years. (Ed.)

The Loess-Paleosol Sequence in China and Climatic History