In the January number of the Bulletin,3 W. C. Krumbein, in discussing post-depositional changes in sedimentary deposits, suggests that “If the definition of diagenesis is broadened sufficiently, it may include weathering changes.” From this and subsequent remarks one may infer that Dr. Krumbein is in favor of redefining diagenesis in this way.

The term diagenesis now has a fairly definite meaning for geologists the world over, referring to those changes which take place in sedimentary deposits on the bottoms of seas and lakes during and soon after deposition and before deep burial. Such changes are mostly chemical and...

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