Figure 2-1. A small stylolite (red arrows) at which quartz silt and small opaque grains (probably largely pyrite) have accumulated as a residue of pressure dissolution. Among the evidence that they have been concentrated as a residue are the presence of quartz silt (large black arrows) and small opaque grains (small black arrows) in the surrounding dolomitic intraclastic packstone. Another image shows more evidence of removal of material by pressure dissolution in the same rock. .

      Photomicrograph was taken in plane-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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