PLATE IV 





Fig. 1. Sample 81, siliceous Globigerina ooze, central Pacific, 

 depth 4953 meters; 0.5- to 0.25 -mm size grade; broken and en- 

 tire shells of pelagic foraminifera, including Globorotalia tumida 

 and PuUeniatina obliauiloculata . arenaceous foraminifera, radio- 

 laria, sponge spicules, manganese grain (CaC03 content of sam- 

 ple, 40 per cent) 



Fig. 2. Sample 22, ferruginous Globigerina ooze, southeast Pacific, 

 depth 4116 meters; 0.5- to 0.25-mm size grade; broken and entire 

 shells of pelagic foraminifera, including Orbullna universa. Glo - 

 borotalia truncatuUnoldes. Globigerina conglomerata. inflata. 

 rotundata. Globigerinoldes conglobata . benthonic foraminifera, 

 including Pyrgo fragment, Lagena semlniformis. Uvigerina sp.; 

 abundant manganese grains (CaCOa content of sample,42 per cent) 



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