Chukchi Sea 



Gulf of 

 'V Anadyr 



J 



7^ i-S?/' 



-^■21 ----. 



J L 





Fig. 3. Areal distribution of carbon isotope values of sediments. 



Chukchi Sea 



f^ (D w 



Fig. 5. Areal distribution of nitrogen concentrations in sediments. 



Chukchi Sea 



J \ \ L 



CO 



CO 



Fig. 4. Areal distribution of nitrogen isotope values of sediments. 



0.0 



0.1 0.2 0.3 0.4 



Nitrogen (% by weight) 



Fig. 6. Relationship between carbon and nitrogen concentrations in sediments. 



336 



