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Published online by Cambridge University Press: 01 May 2009
In a previous communication to this MAGAZINE I suggested that the Loess originated from the thawing and refrigeration, during the major and minor glaciations, of the upper layer of the soil, which, where it was unprotected by land ice, was permanently frozen to a great depth; such layer having a sliding motion which caused the material to accumulate in the hollows, and so expose continually to this action over the rest of the surface, fresh subsoil which had been previously permanently frozen. I now supplement this by a particular examination of the way in which such process appears to me to have acted in originating that part of the Loess which is represented by the ‘Limon,’ or briekearth, of Picardy.
1 This brick-earth with angular fragments of flint is shown by Prof. Prestwich (Q.J.G.S. vol. xv. p. 216) to overlie and ‘ravine’ these sands in the sections of them which he gives from Avisford, just as M. de Mercey describes the base of the limon to ‘ravine’ the subjacent deposits in Picardy.Google Scholar