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Our knowledge in the past few years concerning the generalgeology of the Western Hills has been greatly improved.A detailedreport with geological maps is now being prepared by the members of 相似文献
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INTRODUCTION The part of the Lower Huangho Valley with which this paper deals is bounded on the west by the T'ungkuan Bend where the Loho (洛河) and the Weiho (渭河) join their master stream and on the east by the Sanmen Rapids (三门急流). The area which lies between P'ingluhsien (平陆县). 相似文献
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1. Syclinal warping at the end of the Cretaceous time?(Phase Ⅲof Yenshan Movement?).Intermont sedimentation.Deposition of the lowerand middle portions of the Kuanchuang Series during the Eocene(and earlyOligocene?)time. 2. Block-faulting and progressive tilting during the late Oligocenetime(Nanling Movement).Accumulation of the "bajada breccias" in con-nection with the faulting and the inauguration of the Tanghsien consequentdrainage system. 3. Tanghsien erosion to full maturity during the Miocene time. 4. Prolonged period of chemical weathering.Fossil soils withmanganese-iron pisolites and karst surfaces formed(Pliocene). 5. Deposition of gravels(Late Pliocene?). 6. "Z erosion" of moderate dissection followed by the accumula-tion of the Concretionary Reddish Loams (Lower Pleis cene). 7. Chingshui dissection along old lines,followed by the deposition ofbrownish-gray loams and loess of the Malan epoch(Upper Pleistocene). 8. Present cycle of erosion and deposition. 相似文献
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