|Figure 6-4. Bone fragment (amber) in the midst of spelean calcite (C). "P" indicates pore within and beside bone fragment. The bone material is nearly extinct (black) with only a faint sweeping extinction in cross-polarized light.
Photomicrograph was taken in plane-polarized light; field of view is 1.2 mm wide. Drostky's Cave, Botswana; Stalagmite DS87; thin section BDS1.5-2; thin section BDS1.5-2; sample collected by Drs. George A. Brook and John Cooke.
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