Figure 7-6. Six layers of aragonite (A) and one layer of calcite (C) in a stalagmite. Note that layer boundaries between two uppermost layers grade from readliy apparent at right to less apparent at left, illustrating the need to look for layers all across a stalgmite. Red "Q" marks a detrital quartz grain around which an aragonite layer is wrapped.      Photomicrograph was taken in plane-polarized light; field of view is 2.0 mm wide. Drotsky's Cave, Ngamiland Botswana; Stalagmite BDS1 (DS87); thin section BDS 7-8. Sample collected by Drs. George Brook and John Cooke.
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