640 



ME. G, ATTWOOD OX ATJEIFEROUS TEACTS OF 



varies from black to greenish-black and dark grey in colour, verj* 

 compact (see Eock-sections, nos. 2 and 4, p. 651). The hornblende 

 is green, and the felspar generallj' plagioclase. 



The specific gravity of Xo. 4 was found to be 3*19, and it contained 

 49'85 per cent, of silica. The qualitative analysis showed the rock 

 to contain a small quantity of organic matter, a fair percentage of 

 iron-oxides, with a little alumina and a trace of manganese. 



Mica -schists having a soft silvery as well as yellowish appearance 

 are abundant in the Melkote Area. The general strike of the 

 mica-schists is about jS". 20° E. ; but the dip, as will be seen by 

 the section, fig. 3, varies from east to west, and at the east end of 

 the section the dip is nearly vertical ; but at the same time the 

 strata are very irregular and much contorted. 



Evidences of great crushing-movements are seen by examining the 

 slickeusides on the bands of quartzite (fig. 4). The bands of quartzite 

 are narrow, being from 5 to 20 feet thick, running parallel with 

 the schists, and they have also the same dip. Large masses of 

 vein-quartz were also found scored, and with their surfaces showing 

 slickeusides. The direction of the crushing-movement appears to 

 be nearly vertical, from the slickeusides on the quartzites and 

 quartz hi situ. However in some parts of the section there are 

 evidences of horizontal as well as lateral movements. In one 

 case in question the lateral throw was found to be about 60 feet 

 (fig. 5). 



Fig. 5. — Flan showing lateral displacement of Quartz-vein. 



Quartz -vein. 



b. Schistose rock. 



In the mica- schists, especially the soft silvery-looking schist, 

 crushed garnets of different sizes were found, varying from one inch 

 to one tenth of an inch in diameter, and flattened out to a great 

 extent (figs. 6, 7) ; for instance, a garnet off of an inch in diameter 

 would be only | of an inch thick in the centre at its widest part. 



