Figure 6-1. Carapaces of ostracods (arrows) in a stalactite from Namibia. Ostracods are bivalved crustaceans that live in water. The arcs visible here are cross-sectons through those valves or thin shells, which consist of calcite.    Photomicrograph was taken in plane-polarized light; field of view is 0.8 mm wide. Guinas Cave, Namibia; Sample G92-5; thin section G92-5A. Sample collected by Dr. George A. Brook.
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