. 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 [No. 136 older unreduced upland rise above it as monadnocks, and the valleys carved out below the peneplane represent so mature a dissection that by far the major part of the old erosion plane has been destroyed. Provi- sionally, this old surface of mature erosion h
. 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 [No. 136 older unreduced upland rise above it as monadnocks, and the valleys carved out below the peneplane represent so mature a dissection that by far the major part of the old erosion plane has been destroyed. Provi- sionally, this old surface of mature erosion has been called the Mongolian peneplane, because of its very widespread distribution in Mongolia (Fig. 2).. Fig. 2. The maturely dissected Mongolian peneplane in southern Mongolia, on the Kalgan-Urga trail. The picture is drawn from a panoramic photograph, taken at the upland level, looking south and southwest. It is possible that this peneplane is the surface which passes under- neath the Cretaceous sediments, which undoubtedly rest upon a mature surface of erosion.^ This matter will be discussed in another paragraph. The peneplane was first observed in the granite mountains of south- ern Mongolia, at an altitude of 5,300 feet (1,600 meters). But as we climbed toward the Arctic divide, at about 6,000 feet (1,830 meters) south of Urga, an old mature surface was again seen beveling the schists N aner Valley Jola River (4350'). Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Central Asiatic Expeditions (1921-1930); Andrews, Roy Chapman, 1884-1960; Matthew, William Diller, 1871-1930. [New York : American Museum of Natural History
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