FISHERY BULLETIN: VOL. 82, NO. 1 



O 1976 1977 



INlMll.lllllllll 



Treatments 



Labels 



1978 



1979 



1980 



PC of 3rd Tooth 



100 pm 





I'll 



FIGURE 6.— Tooth of live dolphin ACM 104 extracted 2 February 1981. A. Untreated thin section in UV light showing 

 location of TCL labels (150X). B. Same section as in 6A in plain light showing position of key labels bracketing last 4 yr of 

 deposition. Light GLG boundary layers appear to have been deposited in or about August. C. Chart showing match of 

 labels and treatments. D. Thin section showing 1 1 complete annual GLGs (separated by dark marks) as interpreted 

 from labels (39X). 



216 



