Figure 1-3. Sutured intergranular contacts (red arrows) between echinoderm grains in a bioclastic grainstone. Sutures are so abundant that this sample approaches fitted fabric, but syntaxial cements are visible beyond the limits of the original echinoderm grains (black arrows), so that some intergranular space is preserved. Note that the sutures are in general closer to horizontal than vertical, and that the cements are at the sides, rather than tops and bottoms, of grains.

      Photomicrograph was taken in plane-polarized light; field of view is 2.4 mm wide. Ordovician of southwestern Virginia; thin section ZZ116-2. Sample collected by Dr. Steven M. Holland.

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