OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 655 



11. Station 280; March 2, 1903; lat. 68° 40' S., long. 30° 18' W. ; depth 2511 

 fathoms. 



Glacial Clay. — Obtained in quantity from the Buchanan sounding-tube, as were 

 all the subsequent samples, unless mentioned to the contrary. Drab grey in colour, 

 light grey when dry. No odour. A fairly tough clay, but with numerous gritty 

 particles, less numerous, however, in the deep layers of the deposit. 



CaCO^ .-—Nil. 



Siliceous organisms : — A trace. 



Mine7-ah — Upper part, 20 per cent., rounded and angular, m. di. 0*16 mm. : — 

 Quartz, green hornblende, zircon, felspar, tourmaline, chlorite. Lower part, 10 per 

 cent. m. di. O'l mm. : — Quartz, hornblende, felspar. One fragment of hornblende 

 gneiss 5 mm. in diameter. 



Fine washings: — Similar to No. 10. 



12. Station 282; March 3, 1903; lat. 68° 31' S., long. 32° 08' W. ; depth 2452 

 fathoms. 



Glacial Clay. — Bluish -grey when wet, dries a very light grey. Greasy clayey 

 feeling with gritty particles. 



CaCOg.-— Nil. 



Siliceous organisms 1 per cent. : — Fragments of diatoms. 



Minerals 15 per cent., angular and rounded, m. di. 0'07 mm. : — Quartz in 

 abundance, some of it rosy red, a little felspar, biotite, hornblende, tourmaline, and 

 (?) apatite, magnetite, zircon, some particles of volcanic glass, and a few manganese- 

 coated grains. 



Fine washings 84 per cent. : — Similar to No. 10, i.e. some amorphous clayey 

 matter, but containing abundant very fine mineral particles. 



13. Station 286; March 5, 1903; lat. 68° 11' S., long. 34° 17' W. ; depth 2488 

 fathoms. 



Glacial Clay. — Greenish-grey in colour, light grey when dry. A greasy clay, 

 but with more gritty particles palpable than in previous samples. 



CaCO.^ 5 per cent. (Anal.) : — Globigeiina dutertrei, the largest scarcely 0'3 mm. 

 in diameter, others much smaller. 



Siliceous organisms : — Nil. 



Minerals 15 percent., m. di. O'l mm., many as large as O'l 5 mm., all the larger 

 being rounded or sub-angular : — Quartz and hornblende chiefly, felspar (orthoclase, 

 plagioclase, and microcline), augite, glauconitic casts of foraminifera, (?) Glohigerina 

 pachyderma, a little dark volcanic glass, magnetite (rare), zircon (one), a few 

 manganese nodules — one about 1 mm. in diameter. 



Fine washings 80 per cent. : — Similar on the whole to previous samples, but 

 contains undoubtedly more amorphous clayey matter. 



