236 Geological Society : — 



of Sudbury, and of no advantage to the smelter. The differences 

 above recorded are probably not due to differences in the containing 

 rocks, since similar differences may be noticed in the pyritous deposits 

 of Canada, where the country-rocks are identical. 



3. " Notes on some of the Auriferous Tracts of Mysore Province, 

 Southern India." By George Attwood, Esq., E.G.S., F.C.S., &c. 



The author was employed during parts of 1886-7 in inspecting 

 a large area of mineral lands in Southern India supposed to be 

 auriferous, and the paper contained the results of his observations. 



1. Mellote Section. This section (in the Hassan district of the 

 province of Mysore), starting one mile west of Melkote in a north- 

 easterly direction, exposed gneiss, mica-schist, hornblende-schist, 

 quartzite, talc- and chlorite-schists, eclogite, and quartz veins, 

 striking generally N. 20° E., and having varying dips. The eclogite 

 was described at length, and special attention was called to the 

 flattening of the contained garnets, which were probably originally 

 almandite ; other evidences of great crushing were also noted. 



In this section and on most of the schistose lands of Mysore a 

 dull grey, nodular, and botryoidal calcareous deposit, known as 

 " kunkur," is found in nullahs, on hill-sides, and on the detritus of old 

 gold washings, and it was suggested that the contained lime was 

 derived in great measure from hornblende-schists. 



Many quartz outcrops, large at the surface but diminishing in 

 thickness downwards, were met with at the east end of the section ; 

 these veins have a strike about N. 15° E. to IN". 20° E., coincident 

 with that of the schists. 



Extensive gold-washings have been carried on in the ravines 

 and hill-sides, and the mode of occurrence and character of the gold 

 were described. 



The author considered the schists, as well as the quartz veins, to 

 belong to very old series of rocks, probably Archaean. 



2. Seringapatam Section. The second section was taken in a south- 

 easterly direction from the 72nd milestone on the Seringapatam and 

 Bangalore road to the N.W. side of the village of Arakere. Gneiss, 

 hornblende, and mica-schists, &c, were here met with, striking about 

 N. 20° E. with varying dips. These were traversed by auriferous 

 quartz-veins which had been largely worked, and the author gave a 

 description of the former methods of extracting the gold. 



At the S.E. end of the section the schists were found to be much 

 broken by porphyrite dykes of much more recent origin, most likely 

 of Tertiary age. A small granite dyke intersected the Elliot Lode 

 diagonally, and was considered to be of Upper Tertiary age. 



3. General Observations. The author described the results of 

 traverses of other districts ; he pointed out the evidences of great 

 pressure which had broken up the gneissic rocks and compressed the 

 schists, and conjectured that this might have been produced by the 

 gradual rise of the Eastern and Western Ghats, and finally called 

 attention to the great denudation which the Mysore plateau had 

 undergone. 



