Figure 12-2. Scanning electron micrographs of the inner 

 shell layer gro\AAth 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 



