644 



ME. G. ATTWOOD ON^ ATJEIFEROTJS TRACTS OF 



coating, and in that respect they resemble gold nuggets found in the 

 district of Pastora, Venezuela, South America *. 



Pig. 9. — Section sTiowhig double faidtmg of a Qiiartz-vda. 



a. Quartz. 



h. Horn blende-schist. 



The gold has a bright gold-colour with the exception of its outer 

 coating, and appears to be of great purity ; by comparing it with 

 other gold grains of a known fineness, it will be about ^^ fine. 



Prom the field-examination, assisted by the microscope and chemi- 

 cal analysis, it is highly probable that the gneissic rocks, as well as the 

 hornblende- and mica-schists, also the quartz-veins which accompany 

 them, belong to the very old series of rocks called Archaean. 



2. Seringapatam Area^ 



The second Area is in the neighbourhood of Seringapatam, 

 district of Mysore (see Plan, fig. 10). The line of section takes a 

 south-easterly direction from the 72nd milestone on the Seringapatam 

 and Bangalore road to the north-west side of the village of Arakere. 



Gneiss-rock, rather coarse-grained, is followed by a schistose gneiss, 

 which gives place to mica- and hornblende-schists. The general 

 strike of the gneiss- and schist-rock is about north 20° east, and 

 the dip various, as seen in the section, fig. 11. 



The hornblende- and mica-schists have a sharp dip, nearly vertical, 

 whilst the gneiss-rocks gradually slope away until they recline at 

 an angle of about 35 or 40 degrees. 



* See paper " On a Gold Nugget from South America,'" by Geo. Attwood, 

 Journal of the Chemical Society, Julv 26, 1879. 



