William White's 1972 paper on deep glacial erosion needs to be revisited
William White's 1972 paper titled "Deep glacial erosion by continental ice sheets" (GSA Bulletin, v. 83, p. 1037-1056) was rejected and/or ignored by the geomorphology research community. In that paper White presented a case for widespread and deep erosion of shield areas by ice sheets. There certainly is excellent evidence shield areas on all continents have been deeply eroded, the only questions are when and how did the erosion occur. In the case of North America a strong case can be made that hundreds of meters of Paleozoic, Mesozoic, and early Cenozoic sedimentary rock in addition to unknown thicknesses of underlying Precambrian bedrock has been removed. North American geomorphology history as described in most publications suggests the Paleozoic, Mesozoic, and early Cenozoic sediments were never deposited (or were very thin) in the Canadian Shield area and/or that the sediments were removed by "normal" surface processes acting over many millions of years during Middle Cenozoic time. Evidence for at least one continental ice sheet centered on the Canadian Shield area is excellent. Deep glacial erosion by that continental ice sheet is a much more logical explanation for Canadian Shield erosion than explanations the North American gemorphology research community is providing. Following the publication of White's paper critics pointed out a number of major conflicts with well established geological interpretations of other evidence. But, do those flaws mean White's hypothesis is incorrect, or do those flaws mean the geological interpretations upon which the conflicting evidence is based are incorrect. A scientific revolution is coming in the geomorphology research community, and when that scientific revolution has been completed deep glacial erosion by the North American ice sheet will be an accepted concept. And not only will deep glacial erosion by the continental ice sheet be an accepted concept, deep flood water erosion of the North American continent surface by the ice sheet's melt water will also be an accepted concept.