Figure 4-6. Microcrystalline CaCO3 (M) above a surface of erosion (arrow) in a stalagmite from South Africa. The presence of detrital particles like the quartz grain (Q) in the microcrystalline CaCO3 suggests that the microcrystalline CaCO3 is detrital as well. Another image shows the lateral extent of the erosion surface.
   Photomicrograph was taken in plane-polarized light; field of view is 2.4 mm wide. Wonderwerk Cave, South Africa; thin section WW18. Sample collected by Dr. George A. Brook.
  Speleothem Image
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