664 DR J. H. HARVEY PIRIE ON DEEP-SEA DEPOSITS 



31. Station 391 ; February 27, 1904 ; lat. 66° 14' S., long. 31° 18' W. ; depth 2630 

 fathoms. 



Glacial Clay. — A soft clay of a drab grey colour. Requires much rubbing down : 

 it is so tenacious. Very little grittiuess. 



CaCO,:—mi. 



Siliceous organisms, a trace : — Radiolaria. 



Minerals 3 per cent., angular and sub-angular, m. di, 0'09 mm. ; a few quartz 

 particles up to 0"5 mm. sub-angular, all others angular : — Quartz (one angular 

 fragment 5 mm. long), a little felspar, augite, magnetite, volcanic glass, and 

 palagonite. 



Fine loashings 97 per cent. : — Fine mineral particles and a considerable amount of 

 amorphous clayey matter. 



Note. — In both this sample and No. 30 the minerals, with the exception of the 

 quartz, are chiefly of volcanic origin. 



32. Station 394 ; February 28, 1904 ; lat. 66° 43' S., long. 27° 55' W. ; depth 2685 

 fathoms. 



Glacial Clay. — A loose soft clay of a drab grey colour. Very greasy and requires 

 much rubbing down. Almost no grittiness. 



CaCOj.-— Nil. 



Siliceous organisms : — Nil. 



Minerals 2 per cent., angular, m. di. 0*05 mm. Estimated that if particles down to 

 01 mm. were included, the percentage would be about 5. Quartz, magnetite, augite, 

 felspar, biotite, pumice. 



Fine ivashings 98 per cent. : — A considerable amount of amorphous clayey material, 

 but largely unrecognisable mineral particles under O'Ol mm. in size. 



Nole. — Although the fine washings make up such a large part of this and the 

 preceding two samples, in this respect resembling a Red clay, none of them contain so 

 much real clay as a true Red clay does, none are so difficult to rub down as a true Red 

 clay is, and in all the fine washings contain far too much minute mineral particles 

 — "rock flour" — for them to be regarded as true Red clays. 



33. Station 406; March 3, 1904; lat. 72° 18' S., long. 17° 59' W. ; depth 1131 

 fathoms. 



Glacial Mud or Clay. — Of a dark greenish-brown colour. A fairly tough clay, 

 but with a considerable number of gritty particles. 



CaCO^:—m\. 



Siliceous organisms 2 per cent. : — Chiefly sponge spicules. A few whole diatoms 

 {Coscinodiscus), and some fragments, and a few small radiolaria. 



Minerals 20 per cent, angular and sub-angular, the larger being the more rounded, 

 m. di. 0'17 mm. : — Quartz, felspar, augite, hornblende, serpentine, chlorite, brown mica, 



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