AKAVALLI SYSTEM, 



65 



masses ( 4 2 \, 12363), composed like the dark bands above 

 together with some green-yellow amphibole. Large extensions or 

 thicknesses of these rocks seem indicated. One mile S.S E of 

 Bhetali near Karanpur small patches of a rather hard schist protrude 

 through the alluvium ( 4 *&, 123(51). It possesses a quartz-felspar 

 mosaic m which the lamellar twinning of plagioclase is visible in 

 what appear to be crushed grains. Among this are large irregular 

 areas and groups of grains, more or less connected together, of pyrox- 

 ene, and, with and among this, long and sometimes large 'blades of 

 pale green amphibole. There is a considerable amount of sphene 

 and no iron ores. It is probably an epidiorite or amphibolite in 

 origin. A schistose epidote-rock occurs If miles S.W. of SamJaji 

 specimen No. £&, (12365), and contains minute grains of sphene' 

 It only occurs as a narrow band, probably along the line of 

 junction (discordant) between the mica-schists and the Delhi Quartzite 

 series. 



The gneiss, or gncissose granite, exposures are best seen in tho 

 ,, • Meshva river-bed near Vandiol and also at 



Gneiss or gncissose i . , , , 6U '"' 



granite. Jesangpur. At the former place there are 



... . ,a, o° outcrops in the river-bed, with a rolling 



foliation dipping generally to the N.E., very distinct and marked 

 out by eye-structure and lenticular bands, and also at intervals 

 by thin parallel quartz veins. The rock — ^ and 2 & • 12366 

 and 12367—, contains both muscovite and biotite in relatively small 

 plates, biotite predominating, and disposed at random through the 

 other minerals. It has brownish-green and pale yellow pleochroism 

 I here is much quartz, crowded with minute fluid inclusions also 

 orthoclase, the large irregular eyes of which occasionally show Carlsbad 

 twins ; no microchne. Under the microscope these felspar areas are not 

 well-defined and show strain shadows and crushing at the borders 

 Ihere is a considerable amount of plagioclase in small irregular 

 grains and a few minute zircons. The very regular character of 

 this massive rock suggests a foliated granite of some ancient type 

 A very similar rock from Jesangpur ( 4 *ft, 12368) has the felspar 

 eyes of a faint pink colour and the lenticular structure very dis- 

 tinct. It stands up m massive little crags reaching 20 feet in height. 

 Quartz veins, with abundant tourmaline, become especially pro- 



Quartz-tounnal.ne "?""* **.»* f^™ ?"* * B *™™dz, 



rock. a&Ove \ andiol and near Kavadia, at a position 



where the gneissose granite adjoins the schist. 



