. 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. 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 Cretace
. 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. 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'). Fig. 3. Diagrammatic section across the Tola River at Urga. The figure shows: (1) monadnocks rising above the peneplane; (2) the peneplane; (3) the broad rock terrace; (4) the inner valley cut below the rock terrace. and the younger graywackes. Northwestward, other higher ranges could be seen, and probably the faulted ranges of Transbaikalia are beveled by a peneplane, which in the faulting has been lifted to unequal heights and tilted at somewhat unlike angles in the several fault blocks. At the Tola River, near Urga, the following topographic elements were observed: (1) monadnocks rising above the peneplane; (2) the â Berkey, C. p., and Morris, F, K. 1924. "Basin Structures in ; Bull. Amer. Mus. Nat. Hist., LI, p. 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 origi
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