THE main aim of this paper is to give a general idea of the extension of the glaciers during the Ice-Age in Tibet and in the mountain ranges bordering that great plateau. I shall endeavour to give a comprehensive study, based upon numerous reports as well as upon my own explorations. In September 1929 I had the opportunity of examining the large collection of photographs stored in the map-room of the R.G.S. Amongst this collection there are many which, from a morphological point of view, are extremely interesting, and I shall have occasion to refer to a number of them later on.* The territory to be considered in this paper includes the high mountain ranges of the Kunlun and the Karakoram, the big plateau of Tibet proper, and the Himalaya and Sino-Tibetan ranges. Before dealing with the special investi? gation of ancient glacial troughs and valleys, of moraine walls, striated boulders, trough-shoulders, and so on, I will summarize the main data at our disposal about the above-mentioned regions, beginning with the mountain ranges bordering the Tibetan plateau in the north.
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Emil Trinkler (1930) studied this question.