MYRICK ET AL.: DENTAL LAYERS IN HAWAIIAN SPINNER DOLPHINS 



100 pm 



I I > 



A B 



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Treatment 



Labels 



1976 1977 



i i i I i i n li i_i i i 



1979 



1980 



I "in ii Hi 



lllllllllll 



T"c"dTT g\ IIIIIIIIIMI 



b l d t (■ b-\p C of second too(h 



FIGURE 3. — Labeled tooth taken from dolphin carcass WFP 606. A. Untreated thin section in plain light showing 

 about eight annual GLGs in dentine (separated by arrows). GLGs divided approximately in half by thin, light mid- 

 GLG layers (heavy dark marks). GLGs 6, 7, and 8 were interpreted from positions of tetracycline labels (lettered). 

 Finer dark layers represent lunar monthly layers ( 1 50X). B. Dentine labels in UV light ( 1 50X) . C. Chart showing 

 dates labels were introduced. 



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