THE DEPTH AND MARINE DEPOSITS OF THE PACIFIC OCEAN. 81 



The types of deposit to which these 77 samples are referred are as 

 follows : — 



Globigerina Ooze 49 samples 



Eed Clay 20 " 



Pteropod Ooze 4 " 



Eadiolarian Ooze 2 « 



Volcanic Mud 2 " 



T7 « 

 Detailed Descriptions of the Deposit-Samples. 



( Numbered consecutively as collected.) 



No. 1. Station 2, 27th August, 1899. 

 Lat. 28° 23' N. ; long. 126° 57' W. ; depth, 2368 fathoms. 



EED CLAY : brown, with lighter-colored patches, but appears uniform in 

 composition ; contains a few small manganese nodules. 

 Calcium carbonate : 1 per cent, a few coccoliths. 

 Residue : 99 per cent, brown : — 



Siliceous Organisms (1 per cent), represented by fragments of Radiolaria. 



Minerals (small traces), mean diameter 0.06 mm. ; the most abundant 

 mineral is felspar, represented by orthoclase and plagioclases having the op- 

 tical properties of andesine and labradorite. A more acid plagioclase appears 

 to be present, but its exact nature could not be determined. Volcanic glass 

 (one splinter 2 mm. long), augite (very rare), probably hornblende undergoing 

 decomposition, manganese grains, red palagonite, and small lumps of a 

 whitish opaque substance were also observed. Mineral particles are hei'e 

 extremely rare, only a few having been obtained from the washing of a large 

 quantity of material. 



Fine Washings (98 per cent), amorphous clayey matter. 

 Besides a good supply of the Red Clay, many manganese nodules and 

 slabs of palagonitic tuff described in the sequel, the "Albatross" obtained at 

 this station some rock fragments, determined by Dr. Teall, H. M. Geological 

 Survey, as : — 



(1) hornblende-andesite, 



(2) serpentine, 



(3) fine grained sandstone, 



(4) black chert.' 



1 See Mem. Mus. Comp. ZooL, Vol. XXVI., No. 1, p. 71, 1902. 



