Figure 2-4. Dissolution seam (red arrows) that has removed much of a long brachiopd grain (B) in a Lower Paleozoic dolomitic grainstone. Black arrows point to areas where entire thickness of brachiopod grain survives, as well as cement in the underlying sheltered region (left arow), and to areas where nearly all the thickness of the grain has been destroyed (right arrow).

      Two joined photomicrographs were taken in plane-polarized light; field of view is 4.4 mm wide. US22/322 roadcut just east of Pfoutz Valley Road exit, northern Perry County, Pennsylvania; Sample PA2-6; thin section S-1-144. Sample collected by L. Bruce Railsback.

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