Figure 12-2. Scanning electron micrographs of the inner 
shell layer growth surface of Geukensia demissa 
showing natural shell dissolution. 
NOTE: The differential solubility of calcium carbonate and organic matrices is 
apparent. Stereo pairs were taken with a 6° angular displacement between ex¬ 
posures. (A) x5000. (B) x20000. 
169 
