IIYSORE PROVINCE, SOUTHERN INDIA. 649 



The porplij'ritic dykes are of recent origin and most likely of 

 Tertiary age, whilst the gneiss and the mica- and hornblende-schists 

 belong to the older series called Archaean. 



At the south-east end of the section a small granitic dyke, having 

 a strike about north 30° east, intersects the Elliot lode diagonally. 

 The dyke is about 10 feet thick, and consists of a coarse-grained 

 granite, with fresh-looking quartz-crystals (in places an inch square), 

 light, pearly, almost transparent mica, in thin folia, and large 

 felspar-crystals of a dark cream-colour. The granitic dyke cuts 

 clean through the Elliot lode, but only throws the lode for a few 

 feet, so far as the underground explorations went. The dyke will 

 therefore be of more recent origin than the porphyrites (and 

 probably Upper Tertiary). Some three miles to the south-east of 

 the above, Mr. Walter Marsh also observed some large exposures 

 of a coarse-grained granite, somewhat similar in structure. 



3. General Observations. 



In the Plan, fig. 1, there will be seen three districts marked as 

 hornblende-, mica-, and calc-schists, containing quartz-veins, which 

 have been visited by the author. 



On the west of the plan a large area of land extending from the 

 town of Banavar to the south-east of Honsur Town, a distance of 

 some 45 miles, is marked as being composed of the schistose rocks. 

 Starting from Banavar and travelling south towards Honsur, the 

 schist-band is almost continuous, and on the east and west sides are 

 found the gneiss rocks. 



Extensive old gold-mine workings are met with at intervals 

 nearly all the way, although at the time of my visit no active work 

 was being carried forward on any of the mines. 



Mr. Bruce Foote, E.G.S., of the Indian Geological Survey, who 

 has lately visited the above district, and has issued a Eeport on the 

 same to the Mysore government, calls the schistose rock-series 

 " Dharwar Eock," and says : " Two years ago I gave the name of the 

 Dharwar System, from the fact that the rocks forming it occur very 

 largely in the Dharwar country, and that there I first recognized 

 the necessity of separating them from the great gneissic system 

 with which they had till then been grouped " *. 



To the east of the Banavar and Honsur schist-bands another 

 band occurs, which has been described at some length in the previous 

 sections, as Messrs. Foote, Lavelle, and Marsh had not examined 

 it fully at the time of my visit. 



About 45 miles to the east of the City of Bangalore another 

 schistose series occurs in what is called the Kolar district. In the 

 above series are found some of the best gold-mines in Mysore, viz. 

 Mysore, Nine Eeefs, Nundydroog, Gold Fields of Mysore, «&c., &c., 

 some being worked and many others still lying idle. 



During numerous traverses no quartz-veins carrying gold were 

 found in the gneiss-rocks. 



* See Selections from the Records of the Mysore Government, 1887 : 

 "Report on Auriferous Tracts in Mysore." 



