OF THE SCOTTISH NATIONAL ANTARCTIC EXPEDITION. G50 



Glacial Mud or Sand. — Sounding-tube contained only a small scraping of mud, 

 and came up with a considerable dent on one side as if it had struck on rock, but a 

 considerable quantity of mud was obtained from the trawl later. This may have been 

 partly washed on its way up ; but from the manner in which it was fixed in the trawl, 

 it cannot have been much so, and probably very closely represents the true state of 

 the bottom. A bluish-grey sand or mud with almost no clayey feeling about it. Very 

 orritty, and with very little cohesion. Needs almost no rubbing to separate its contents : 

 merely washing and decantation. 



CaCO^ 2 per cent. (Anal.) : — Foraminifera. 



Siliceous organisms, a trace : — Diatoms [Coscinodiscus), and radiolaria. 



Minerals 70 per cent., m. di. 0*25 mm., sub-angular and angular : — Quartz, felspar, 

 mica, and hornblende in abundance. 



Fine washings 28 per cent. : — Chiefly small mineral particles, some amorphous 

 material. 



Rock specimens from trawl : — A large number of boulders, including some weighing 

 as much as 2 cwts., besides many smaller. A great variety of rocks, although meta- 

 morphic rocks predominate largely. A few show striations. Coarse hornblende gneiss, 

 hornblende patches from fine-grained gneisses, also pieces of felspathic veins, coarsely 

 granitoid and fine granulitic gneiss, garnetiferous gneiss, schistose quartzite, hornblende 

 schist, hornfels, mica schist, phyllite, slate, clayey limestone, clay concretion fairly 

 rich in iron (? from limestone), one piece of fossiliferous limestone with specimens of 

 Archseoojathinse, basalts, quartz dolerite, rhyolite, tuff's, greywacke (not resembling 

 the S. Orkney, Laurie Island rock). 



CJiief foraminifera : — Numerous arenaceous forms belonging to the genera 

 Psammosphwra, Saccammina, Pelosina, Rhabdammina, Hyperammina, Reophax, 

 Hormosina, Trocham^mina, Gribrostoynoides, Cyclammina, and Gaudryina. 



Benthoic lime-builders are represented by Miliolina hucculenta and Cassidulina 

 suhglohosa ; the Globigerinidae by G. dutertrei and G. pachyderma. 



22. Station 317; March 19, 1903; lat. 61° 12' S., long. 42° 44' W. ; depth 210 

 fathoms. 



Pebbles. — Two pebbles brought up in the snapper, washed quite free from mud. 

 One, a pebble 1 x | x ^ inch, rounded and water-worn, composed of dark-coloured 

 banded quartzitic rock with carbonaceous particles ; very similar to the greywacke of 

 the S. Orkneys, and probably derived from there. The other, a pebble f x f x -g- inch, 

 apparently recently broken in two, one face being rough and slightly convex, the 

 other part being well rounded and water-worn, and showing traces of striation, 

 composed of material similar to the other. Both might quite well from their 

 appearance be beach pebbles from the S. Orkneys which had been carried out frozen 

 in bay-ice and deposited on melting. Mud would probably have been found had a 

 sounding-tube been used. 



