In his recent stimulating paper on cementation and loss of porosity by quartzose sandstones of Virginia, W. D. Lowry (1956, p. 493) attempts to relate time of cementation to development of permanent strain (either by deformation or depth of burial). He notes that “because the quartz of the outgrowths appears to be strained fully as much as that of the original grains, most of the welding [cementation according to Riecke’s principle] took place before the development of any appreciable amount of permanent strain.” This statement, in itself, is not a valid criterion. The present writer suggests the possibility that...

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