136 DREDGINGS OF THE MARINE BIOLOGICAL ASSOCIATION: 



Touching and partially enveloping the garnets is a certain amount of 

 chlorite. Water-clear felspar in mosaic form fills all interspaces ; it 

 appears to be albite, and inclusions of apatite are frequent. There 

 seem to be some rare fragments of pale brown-augite. (Plate VII, fig. 1.) 



354/3f. Hand Deeps. 



A schistose or foliated rock, dark steel-grey in colour, and highly 

 lustrous from the abundance of pale mica. Eare eyes of red felspar 

 occur. 



The section does not pass through any of the felspar eyes. There is 

 a distinct banded structure : bands in which hornblende predominates, 

 bands consisting almost entirely of white mica, bands of felspar 

 mosaic. But in every layer tliere is some slight admixture of the 

 other minerals. The hornblende is both uralitic and actinolitic with 

 very distinct indigo tint here and there. It is not entirely free from 

 chlorite. The mica appears perfectly fresh and shows no trace of 

 pleochroism. Both hornblende and mica exhibit a parallelism of 

 arrangement. The felspar is apparently albite, quite clear, with 

 apparently a casual grain of quartz. Grains of sphene are not un- 

 common. 



355/1. West side of East Rutts. 



A brown stained schistose or gneissic rock, exhibiting much contor- 

 tion. 



No part of the slide is entirely free from iron stain. Contorted 

 bands of limonite traverse it, and these appear to have been developed 

 at the expense of mica, bleached residual blades of which are 

 associated with it. All the mica is niucli bent. Parallel with, and 

 touching the limonite, are narrow interrupted bands of calcite. The 

 general ground-mass is a mosaic of slightly stained clear minerals, and 

 apparently consists of albite (?) and quartz in about equal proportions, 

 the quartz showing fluid inclusions with bubbles, and the albite being 

 rather frequently twinned. 



M. 36p. S. 37° W. Edd., 17-5 miles. 



A mica schist or gneiss, shows clear felspar, some in moderate-sized 

 crystals, and mica which is in general rather silvery but in small 

 patches dark bronze. 



There are two orders of felspar, the one represented by slightly 

 clouded crystals of irregular outline and exhibiting signs of crush, the 

 other present in mosaic form. The repeated twinning of plagioclase 

 appears almost constantly in the former, but not at all in the latter. 

 And some few of the larger crystals extinguish differently in different 

 zones, although there is no appearance of zonal structure except 



