|Figure 7-1. Alternating layers of calcite (C) and aragonite (A). Railsback et al. (1994) interpreted these to be annual couplets in which calcite represented the wet season and aragonite the dry season. The area in the red rectangle is also shown in
a higher-magnification view. "P"s indicate pore spaces.
Photomicrograph was taken in plane-polarized light; field of view is 2.1 mm wide. Drotsky's Cave, Ngamiland, Botswana; Stalagmite BDS1 (DS87); thin section BDS9-10. Sample collected by Drs. George A. Brook and John Cooke.
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