Figure 5-2. A: Vertical stylolite (large red arrow) and horizontal stylolite (smaller red arrows) in an Ordovician micstone to packstone. The small and large circles are drill holes for samples for mineralogical and chemcial analysis. B: Detailed view showing offset of horizontal stylolite (black arrows) are vertical stylolite, indicating that the horizontal stylolite formed first.

      Image was scanned directly from sample. US 322 roadcut outside State College, Pennsylvania, U.S.A.; Sample PA4-9. Sample collected by L. Bruce Railsback.

   
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