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



23. Station 319; March 20, 1903; lat. 61° 05' S., long. 43° 20' W. ; depth 214 

 fathoms. 



Sand. — Brought up in the snapper. A muddy sand of a greenish-fawn colour with 

 black specks. Dries much lighter in colour. Almost no coherence, very gritty, and 

 contains rounded water- worn pebbles similar to those of No. 22 up to |^ inch in 

 diameter. 



CaCOo^ .-—Not tested for. 



Siliceous organisms 3 per cent. : — Diatoms : Coscinodiscus, Fragilaria, Actino- 

 cycliis, etc. 



Minerals 90 per cent. : — Kather more than half being particles of gravel about 

 2 mm. in diameter, the remainder sand averaging 0*13 mm. in diameter. The sand 

 grains are rounded and sub-angular; the gravel, angular and sub-angular, i.e. less well 

 water- worn. They show no signs of striae. The grains consist chiefly of quartz with 

 black carbonaceous particles and a green scaly mineral resembling chlorite. This 

 corresponds closely with the constitution of the grey wackes of the S. Orkneys. There 

 are also one or two grains of magnetite, and one piece of green hornblende. 



Fine washings 7 per cent. : — Composed of fine mineral particles and fragments 

 of diatoms. 



24ct. Uruguay Cove, Laurie Island, S. Orkneys; April 20, 1903; depth 5 to 10 

 fathoms. 



Sand. — Obtained in dredge. A fine greenish- grey sand composed of a mixture of 

 dark- and light-coloured particles. The grains do not vary much in size, the average 

 being 0*15 mm. in diameter, the largest being 0'30 mm. The grains are rounded and 

 sub-angular. Compared with the gravel and sand obtained by sifting the mud from 

 the trawl of March 18, 1903 (No. 21, 1775 fathoms), the grains are much more uniform 

 in size and more rounded and polished than the small grains of that sample, but, if 

 anything less so than the larger gravelly grains. The grains are chiefly quartz, some 

 clear but mostly cloudy with chlorite, carbonaceous matter, and (?) kaolin. A little 

 hornblende. 



Siliceous organisms 5 per cent. : — Diatoms : numerous littoral and ice forms. See 

 p. 676, Dr Gran's report on the diatoms. 



246. Station 325; Scotia Bay, Laurie Island, S. Orkneys; July 22, 1903: 

 depth 36|- fathoms. 



Mud. — Brought up in the snapper sounding-lead. A fairly tenacious mud when 

 brought up, of a dark greenish-drab colour, and smelling strongly of HgS. Rubs down 

 easily with a feeling like that of clay and fine sand mixed. 



CaCO^ .-—Nil. 



Siliceous organisms 5 per cent. : — Diatoms : a mixture of pelagic and littoral forms. 

 See p. 676 for Dr Gran's report on the diatoms. Sponge spicules. 



