. 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. 114 Bulletin American Museum of Natural History [Vol. LI the next locus of deposition was in still another basin, or possibly back in the first. Each basin had its rhythm of alternating deposition and quiescence, which probably implied removal of part of the earlier deposit. Some basins, how
. 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. 114 Bulletin American Museum of Natural History [Vol. LI the next locus of deposition was in still another basin, or possibly back in the first. Each basin had its rhythm of alternating deposition and quiescence, which probably implied removal of part of the earlier deposit. Some basins, however, continued to warp intermittently during longer periods of time than others. 3. Small units, such as the Mongolian gobi basins, carrying shallow sedimentary fills, probably cannot of themselves set in motion the deep- seated shift of material required by the theory of isostasy. It is not improbable that we sometimes overestimate the effect of the positive weight of the sediments, as well as of the negative load due to stripping of up-arching areas, as the actuating causes of warping. This thesis does not imply that the authors do not accept the principle of isostasy as applying to earth movements of the first magnitude. We will describe two basins briefly, a faulted or piedmont basin, and a warped or plains basin. Faulted or Piedmont Type of Gobi Basin Each of three ranges of the eastern Altai, the Baga Bogdo, Artsa Bogdo and Gurbun Saikhan, presents essentially a fault-front along its northern margin (Fig. 9). -Peak'df Baron Shiliula -Uskuk Mh (wesr of this section) OndarSair ^â^Restored profile of eroded lava flow ⢠Hsanda Gol. Fig. 10. Cross section of the Baga Bogdo faulted gobi basin. Though on a much smaller scale, this section is almost continuous with Fig. 4, lying south of the latter. The Uskuk fault-mountain lies just west of the section and so is drawn in dotted lines. Part at least of the sediments once rested upon the Uskuk block, because remnants of sedim
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