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The granulometrical and mineralogical studies of the fallen dust collected at Beijing during dust-haze weather on April 18, 1980, show that it resembles the typical Pleistocene loess of China in composition and texture. The fallen dust is mainly composed of silt-size grains as are those of the loess. Quartz, feldspar, and carbonates constitute more than 90% of the total amount of the fallen dust, and they are subangular to subrounded. These characteristics of mineral grains of the fallen dust show evidently that it is an up-to-date loess.

Meteorological study indicates that this loess was transported to Beijing by a sand...

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