6 GRIESBACH : RAMKOLA AND TATAPANI COAL-FIELDS. 



hornblendic schists and garnet rock associated with this micaceous quartz 



schist. The bedding is somewhat obscure, owing 

 Garnet rock. . • i i i 



to the dense vegetation covering the whole country. 



Though there is much of the rock exposed in patches and isolated 

 masses, yet the bedding can only be observed here and there. 



The general character of a micaceous quartz schist remains the same, 

 with the only difference that the lamination is more distinct towards the 

 Changes into a mica ^®^^ ' ^^^ ^®^i' Maiapur the rock is almost a mica 

 ^'^^^^^- schist. The southern prong of the great fork 



above mentioned is different in aspect and lithological character. It forms 

 a lower undulating country, stretching away to the gneiss Pats south of 

 it, and well exposed in all streams between Dumarkola and Pertabpur. 



Though still quartzose, the rock has here more 

 Pertabpur mica schist. , i i • i 



the character of a mica schist, extremely brittle and 



friable, being made up of very fine sandy grains of quartz and minute 

 laminre of white mica, with garnets as accessory mineral. Separated 

 from this area by the granitic ridges is a series of true mica schists, 

 Thii-dareaofmetamor- hornblende schists and quartzites dipping from 

 phic schists. ^i^g main mass of the granitic ridges ; their strike 



is nearly east- west, and the dip is high, about 55°, to north. 



Isolated masses of similar schists are met with and were mapped within 



Isolated masses of the granitic area, probably left standing when the 



schist in granite masses, intrusive granite forced its way in between the 



beds of metamorphic schists, thus probably explaining also the disturbed 



and folded character of the bedding of the schists. 



Another and by far the largest area of these schists was traversed 



north and east of the Gondwana basin. Beginning 

 Fourth area. 



east of the basin immediately below the Talchirs 



near Mitgain we meet mica schist, strike nearly 



east- west, dip north ; a little further north, form- 

 Mica schist. „ 



ing No. 326 H. T, (1757),^ we meet with 



^ On the 1-inch map. 



( 134 ) 



