Figure 1-1. Sutured to concavo-convex intergranular contacts (red arrows) between ooids (O) in a calcite-cemented (C) grainstone from the Jurassic of Morocco. Black arrows point to the smoth unmodified margins of grains away from intergranular contacts. Note that the modified grain contacts are all closer to horizontal than vertical, which is to be expected if they were caused by loading of overburden. Another image shows a stylolite in the same rock. .

      Photomicrograph was taken in plane-polarized light; field of view is 2.4 mm wide. Er Rachiddia, Morocco; Sample JM4-19; thin section S-3-136. Sample collected by L. Bruce Railsback and Joseph Walsh.

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