Figure 3-4. A: Cap (large red arrows) and sides (small red arrows) of a column of a horizontal stylolite in a Mississippian grainstone. Note that left side of column is marked by insoluble residue like that of the cap and is slightly serrate (black arrows). Right side has little or no insoluble residue and instead has elongate areas of calcite at the tips of the red arrows. B: Left side of an adjacent column. Note serrate nature of boundary (black arrows). These anomalies at the sides of columns can be explained by an major phase of vertical compression to generate the large scale stylolite and then horizontal compression in which the upper block moved right more than the lower block, causing compression of the left sides of upward columns and extension on the right sides.

      Photomicrograph was taken in plane-polarized light. Field of view of A is 1.6 mm wide; field of view of B is 0.4 mm wide. Interstate 24 roadcut near Monteagle, Tenneessee, U.S.A.; Sample ME4-4; thin section ME 4-4. Sample collected by L. Bruce Raislback.

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