. 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. A. PRE-DJADOCHTA TIME U ~p~vy a r p. DEPOSITION OF GASHATO (Paieooene?) Fig. 11. Four stages of warping indicated in the Djadochta basin. A shows an old basin of sandy sediments deposited upon a floor of complex old rocks. B shows initial upwarp that caused the Djadochta sands to be washed d
. 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. A. PRE-DJADOCHTA TIME U ~p~vy a r p. DEPOSITION OF GASHATO (Paieooene?) Fig. 11. Four stages of warping indicated in the Djadochta basin. A shows an old basin of sandy sediments deposited upon a floor of complex old rocks. B shows initial upwarp that caused the Djadochta sands to be washed down into the newly formed basin, without, however, exposing crystalline rocks of the present Gurbun Saikhan range. C shows the deposition of a gravel of angular pebbles, derived from the Gurbun Saikhan rocks, and hence implies that those rocks have been laid bare. D shows the deposition of the Eocene Gashato beds, the peneplaned remnaiit of which is at least .300 feet thick, and may be much more. The structure of the rock floor of the basin is inferred from the granite exposed to the north of the basin, and the rocks observed in the Gurbun Saikhan range. The successive warpings of relatively small throw suggest the method by which this wing of the Altai was made. considerable assorting. The onlj^ earlier sand of which we have knowledge in the region is the Oshih. Now the highest member of the Oshih that we have seen is a red-and-white sand, called the Sairim member, which is strikingly similar to the Djadochta sand in composition and 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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