The first step in the determination of the origin of stylolites is to establish the time when they were developed, i.e. do they antedate the consolidation of the enclosing rock or were they developed subsequently as demanded by the solution-pressure theory. The writer had previously presented photographic illustrations of stylolitic structures in the Indiana limestones and the Lockport, N.Y., dolomite that could not have been formed in hardened rock. These are further discussed and additional illustrations of stylolite structures from the Tennessee "marble" are presented as examples of stylolite seams which could only have developed in unconsolidated plastic calcareous sediments.

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