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In the case of the last ice age several depressions of the snow line can be established in the sub-tropics and tropics, although these, however, did not run concurrently. It is necessary to start out from the assumption that the relationship of the snow line position, the permafrost boundary and the polygonal soil boundary was not con stant during the late Quaternary, since fluctuations in the hygric climate occurred independently of thermal fluctua tions. This holds good for the sub-tropics on the one hand and for the tropics on the other. In this connection attention should be drawn to the prob lems arising in large areas from reconstructions frequently

Beobachtungen und Überlegungen zur eiszeitlichen Depression von Schneegrenze und Strukturbodengrenze in den Tropen und Subtropen