Bulletin of the Geological Society of America . Figure 5.—Blockdiagramm eines normalen rersenkten Orogen, dessen Vorland z, T. stehen getliebeti ist Kobers figure 31, page 166. He uses similar argument in the case of the Andes, where dominantlyeastward overfolding and thrusting have been reported. An old land-mass to the west has certainly disappeared, and he believes the westernlimb of a great orogen went down with it, leaving only the eastern borderranges exposed. This explanation calls for selective faulting on arather large scale, for it demands quite accurate cleaving of an orogenetic Jap
Bulletin of the Geological Society of America . Figure 5.—Blockdiagramm eines normalen rersenkten Orogen, dessen Vorland z, T. stehen getliebeti ist Kobers figure 31, page 166. He uses similar argument in the case of the Andes, where dominantlyeastward overfolding and thrusting have been reported. An old land-mass to the west has certainly disappeared, and he believes the westernlimb of a great orogen went down with it, leaving only the eastern borderranges exposed. This explanation calls for selective faulting on arather large scale, for it demands quite accurate cleaving of an orogenetic Japa n. Figure 6.—Blockdiagramm des japanischeii OrogenKobers figure 34, page 168. zone along its median line throughout the length of a continent. ButKober thinks we should expect various modifications of the t3^picalorogen. One foreland may be submerged and one entire system of 0 Evidently Kober is not aware of this relationship, and it appears that he does notconsider the great discrepancj in age between the folding in the Sierra Nevada andthe Rocky Mountain thrusting. Other erroneous conceptions are evident in his dis-cussion of North American geology. 238 C. R. LOXGAVELL KOBERs THEORY OF OROGEXY border ranges with it (figure 4). Parts of both forelands ma} breakdown, carrying the entire orogenetie zone, perhaps leaving the tops ofborder ranges projecting above sealevel as chains of islands (figTire 5).The island chains east of Asia may represent a combination of thesetwo modifications (figure 6). The eastern foreland is covered by thePacific; a typical foredeep borders Japan; the Yello
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectgeology, bookyear1890
