Experiments with unconsolidated muds, and petrofabric studies of some ancient peritidal carbonate rocks, suggest that intense fenestral alteration of micritic sediments can lead to the in situ formation of grainstones of diagenetic origin. Intermediate stages in this process have been recognized in many ancient rocks. The contemporaneous diagenetic modification of such grainstones commonly results in the formation of pisoliths and associated features that mimic those found in marine pisolites as well as in pisolitic caliche deposits of either marine or meteoric origin.

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