Figure 5-4. Two detrital carbonate grains (D), which are probably dolomite, with a detrital quartz grain (Q) in the midst of spelean calcite (C). A possible third detrital carbonate grain is labelled "D?" Detrital carbonate sand or silt grains are evidence of a dry climate and can be used in paleoclimatology (Railsback et al., 1999).      Photomicrograph was taken in cross-polarized light; field of view is 0.8 mm wide. Drotsky's Cave, Botswana; Stalagmite DS87; thin section BDS1.5-2; sample collected by Drs. George A. Brook and John Cooke.
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