Stylolites developed on a microscopic scale along grain boundaries were found in the chert facies of the Cut Bank sandstones, Cut Bank Oil Field, Montana, and the interpenetrating columns of chert and dark residue along the seam are similar to other stylolites. Associated with the microstylolites are quartz grains imbedded in chert grains and secondarily enlarged quartz grains. The development of microstylolites and enlargement of quartz grains has affected the porosity and permeability of the producing horizon in the Cut Bank Oil field. The authors view the evidence here presented as support to the pressure-solution theory of origin of stylolites.

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