Figure 7-17. Surface of erosion (arrows) at which underlying layers are truncated. The surface is largely coated with microcrystalline CaCO3; the microcrystalline CaCO3 in the rectangle is shown in a higher-magnification image. The material above the erosion surface also contains some voids (V).    Image is a mosaic of six photomicrographs that were taken in plane-polarized light; field of view is 12.5 mm wide. Wonderwerk Cave, South Africa; thin section WW18. Sample collected by Dr. George A. Brook.
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