PLATE Xn 



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

 4953 meters; 0.25- to 0.12-mm size grade; skeletons of radiolaria, 

 sponge spicules, a few shells of pelagic foraminifera (CaC03 con- 

 tent of sample, 40 per cent) 



?.vSHUi.Ml 



Fig. 2, Sample 61, gray clayey mud, northeast Pacific, depth 4026 me- 

 ters; 0.25- to 0.12-mm size grade; skeletons of radiolaria, shells 

 of arenaceous foraminifera, manganese flakes, volcanic glass 

 (CaC03 content of sample, 1 per cent) 



179 



