Figure 2-3. Quartz grains (Q) at a stylolite (red arrows) in an Ordovician dolomitic intractlastic packstone. Note that the grain at left has relatively smooth edges away from the stylolite but has a serrate margin at the stylolite, akin to quartz grains shown in another image from the same sample. At right, two quartz grains have met at the stylolite, isolating the residuum of small opague grains between quartz. The area in the red rectangle is shown in an accompanying image.

      Photomicrograph was taken in cross-polarized light; field of view is 2.4 mm wide. Roadcut on US 322 bypass outside State College, Pennsylvania; Sample PA4-2; thin section S-1-146. Sample collected by L. Bruce Railsback.

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