Figure 2-7. Horizontal stylolite (large red arrows) in a tightly compacted Devonian bioclastic grainstone. The grainstone approaches fitted fabric, but very small areas of cement as echinoderm overgrowths (small red arows) technically preclude use of that term to describe this sample. The sample nonetheless shows that stylolites can form in poorly cemented rocks.

      Photomicrograph was taken in plane-polarized light; field of view is 2.4 mm wide. Alpena, Michigan, U.S.A.; Sample ME 70-19; thin section S-1-114. Sample collected by L. Bruce Railsback.

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