664 



AKHHENIUS 



[chap. 25 





Fig. 5. Two photographs from the floor of the Atlantic Ocean, taken a few hundred feet 

 apart, show the marked local variability in concentration of manganese nodules. 

 (Photo: Bruce Heezen, Larnont Geological Observatory, Columbia University.) The 

 locality is further discussed by Heezen et al. (1959), who include a third photograph 

 from the same station (pi. 11, fig. 6). 



