47 



Black Rock Harbor 



>3000 

 2500-3000 



20 40 60 80 



Percent of Samples 



100 



□ Zn 



jCu 



|Cd(x100) 



New Haven Harbor 



E 



Q. 



tz 

 o 



c 

 CD 

 O 



c 

 o 

 O 



>3000 

 2500-3000 " 

 2000-2500 

 1500-2000 ' 

 1000-1500 ' 

 800-1000 





N=20 (Zn.Cu) 

 N=5 (Cd) 



600-800 



~n 







400-600 



m ~n 



<400 







i 



20 40 60 80 



Percent of Samples 



100 



□ Zn 



iCu 



|Cd(x100) 



Figure 4-2. Trace metal (Zn, Cu, Cd) concentration frequency distributions of samples 

 from the Black Rock and New Haven Harbors 



Sediment Core Chemistry Data Summary from the MQR Mound, August and December 1991 



