. Central Asiatic Expeditions of the American Museum of Natural History, under the leadership of Roy Chapman Andrews : preliminary contributions in geology, palaeontology, and zoology. Central Asiatic Expeditions (1921-1930); Scientific expeditions; Natural history; Scientific expeditions; Natural history. AMERICAN MUSEUM NOVITATES Published by Number 136 the American MusEtria of Natural History New York City October 16, 1924 THE PENEPLANES OF MONGOLIA^ By Charles P. Berkey and Frederick K. Morris This paper is another of the brief announcements that have been issued from time to time by the g
. Central Asiatic Expeditions of the American Museum of Natural History, under the leadership of Roy Chapman Andrews : preliminary contributions in geology, palaeontology, and zoology. Central Asiatic Expeditions (1921-1930); Scientific expeditions; Natural history; Scientific expeditions; Natural history. AMERICAN MUSEUM NOVITATES Published by Number 136 the American MusEtria of Natural History New York City October 16, 1924 THE PENEPLANES OF MONGOLIA^ By Charles P. Berkey and Frederick K. Morris This paper is another of the brief announcements that have been issued from time to time by the geologists of the Third Asiatic Expedi- tion. A larger chapter on the Physiography of Mongolia is in preparation; but, as references are being made in other connections to the "Gobi Peneplane/' the "Mongolian Peneplane," etc., it seems desirable at this time to define these baselevel surfaces, even though adequate discussion,. Fig. 1. Generalized map of Mongolia. Mountainous areas are shaded in slanting lines. Lowlands are white, and the deeper depressions are stippled. The Arctic divide is shown by a hne of round dots. The routes of the Expedition are shown by heavy broken lines. Index letters along the route of the Expedition indicate the following places mentioned in the text: K (northwest of Peking), Kalgan; PK, P'ang Kiang; IM, Irdin Manha; AO, Ardyn Obo; OS, Ondai Sair. Sain Noin Khan is in the Khangai Mountains, on a river that lies south of the Arctic divide, about midway between the Ondai Sair and M of Mts. Uskuk Mountain, not shown on this map, is just west of Ondai Sair. especially of the problems of their mode of origin, must await the publication of the larger report. The Mongolian Peneplane.—A clearly defined ancient erosion surface bevels all the mountainous areas of Mongolia. Remnants of an 'Pubhettions of the Asiatic Expeditions of The American Museum of Natural History. Contribu- tion Please note that these images are extracted from sc
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