SECT. 3] 



PELAGIC SEDIMENTS 



673 



100^ 



#^ 





% 



d 





#n^ 



(a) 



(b) 



Fig. 10. Cosmic spherules from deep-sea sediments: (a) silicate spherules; (b) magnetite- 

 coated nickel-iron spherules. (From Hunter and Parkin, 1960.) 



