CHAPTER 15 



41' 



4 0° 



39° 



38' 



25 nmi 



25km 

 I I L_l I I 



71' 



FIGURE 15-1— Approximate regions of oxygen-depleted (< 2 ml/1) bottom waters in 1968, 1971, 1974, 1976, and 1977, Sources: 1977 based on 

 data from RV Cape Henlopen cruise, Aug. 28-30, 1977; other years summarized from accounts in chapter 1. 



325 



