Figure 7-4. Fringe of crystals (arrow) highlighting boundary between third calcite layer (C3) and fourth calcite layer (C4) in an accompanying lower-magnification image of seven calcite layers in a stalagmite.
     Photomicrograph was taken in plane-polarized light; field of view is 0.20 mm wide. Drotsky's Cave, Ngamiland, Botswana; Stalagmite BDS1 (DS87) ; thin section BDS5.5. Sample collected by John Cooke and George Brook.
   
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