|Figure 7-7. Layers (red arrows) in aragonite defined by small inclusions. A
high-magnification image shows the area in the red rectangle. Rafter (1997) concluded that these are annual layers formed in the second half of the twentieth century, but her SEM and microprobe investigations yielded no clues to identify clays or other materials in the inclusions that define the layers.
Photomicrograph was taken in plane-polarized light; field of view is 2.0 mm wide; arcs at blue arrows at artifacts of thin-section preparation. Anjohibe Cave, Madagascar; Stalagmite MA1; thin section MA1-1. Sample colected by Dr. George A. Brook.
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