Exception is taken to T. W. Harbaugh's assumption that cross-laminations are an index to the detrital origin of a limestone deposit (J. Sediment. Petrology v. 29, no. 1, p. 30-37, 1959). Various mechanisms such as reef erosion and deposition in an adjacent lagoon, water agitation in the area of formation of chemically precipitated carbonates, and reworking of featurelessmuds into pellets by organisms, which can be cross-laminated by agitated water, are among the mechanisms proposed to invalidate Harbaugh's hypothesis.

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