10 GRIESBACH : EAMKOLA AND TATAPANI COAL-riELDS. 



Between Palgi and Birkepa, numerous hornblende dykes and veins 



traverse the granite^ and, being able to withstand 



en e y es. disintegration better than the surrounding granite, 



these dykes have become gradually high ridges and prominent points in 



the outline of the hills. 



Granite of probably intrusive nature, exactly similar in lithological 



Intrusive granite of character to the Birkepa rock, occurs in the neigh- 



Chiraikund. bourhood of Chiraikund, east of the Rer river. In 



it, or probably along its contact with some trap dykes, was found galena, 



which has been already noticed by Mr. Mallet.^ 



Another detached mass of granite is found east of Chargar, on the 

 Detached areas of Kunhur, about nine miles north of the boundary 

 granite. of the coal-field, and it resembles in lithological 



character the granite of Chiraikund. 



In fig. 2, Plate I, I have shown these isolated masses of granite 

 visible from a considerable distance, elevated in sharp ridges over the 

 evenly denuded surfaces of gneiss as described above, page 4. The fore- 

 ground of the profile, near the deserted village of Chatoli, is one of the 

 numerous trap dykes showing concentric structure. The faulted boundary 

 of the gneiss with the Mahadeva sandstone, in which this trap occurs 

 {vide map), is not traceable in the landscape, owing to the even denuda- 

 tion of the two rocks. 



The sub-metamoephic rocks. 

 As before mentioned, there is a natural boundary of the sediment- 

 ary rocks with the metamorphics on the southern edge of the field 

 between the villages of Hadrai and Bella, and again further west- 

 wards south of Jajawal. It is near these two boundaries that I 

 observed two narrow strips of rocks of pre-Gondwana date, on which 

 the Talchirs rest unconformably. The best exposure is the one between 

 Hadrai and Kandia. The river Morne cuts through the whole section 

 just above Kandia, forming a narrow and rocky gorge. I found a 

 1 Records, Vol. V, p. 23. 



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