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erosion |
Also found in: Medical, Legal, Encyclopedia, Wikipedia, Hutchinson | 0.04 sec. |
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Erosion erosion The slow wearing away by natural forces such as water and wind. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Since the summer of 1882, Spencer (no doubt influenced by William Dawson) had become increasing sceptical about the supposed role of continental glaciers in eroding the basins now occupied by the Great Lakes: he then regarded these basins as due primarily to fluvial excavation, modified only slightly by glacial erosion and deposition. The deposit is interpreted to have been formed by the concentration of uranium minerals leached from nearby highly radioactive intrusive rocks and deposited in an old riverbed channel, which was preserved from glacial erosion by a cover of younger volcanic rocks. Cotton (1942) referred to glaciation as a 'climatic accident' and Pauly (1957) referred to 'world-wide abnormal climates" Such events were regarded as being superimposed on static continents where deep glacial erosion and deposition of coarse bouldery sediments such as tills simply interrupted an otherwise orderly Davisian cycle of landscape and sediment evolution from youth to maturity. |
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