266 Notes upon the Geology of the Rajmahal Sills. [No. 3. 



The gneiss is, generally speaking, deficient in mica ; occasionally it 

 has a granular quartzose aspect, and in other cases is highly crystal- 

 line and in thick masses or beds, so that excepting for its distinctly 

 laminated character, it would be considered a granite (Telobad, Eaja- 

 bhita). This massive variety projecting in well marked ridges 

 across the country, is often split up by joints into nearly columnar 

 masses, the ridges when thus divided, having, when seen from a little 

 distance, much the aspect of huge walls of cyclopean masonry, while 

 some of the masses, standing up singly, look like sepulchral monu- 

 ments. 



These rocks being essentially a portion of the great primary district 

 to the "West, will more appropriately be treated of in detail in con- 

 nexion with that area. 



"Within the boundary of the Damin-i-koh, they stretch irregularly 

 from near Bhooktahn Hill, on the southern boundary at the Brahmini 

 river, by Katticoon, Nargunjo and the western flank of Muhooagurhe 

 hill. Here the boundary turns to the East into the Puchwara pass. 

 up which they extend to the village of Salungi, for about four miles, 

 Prom this, winding Northwards and "Westwards round the base of 

 the Hill of Burgo, their outline again stretches into the Hills, some 

 miles East from Bokrabandh ; passing East of Chundna, of the large 

 Sontal village of Soonduree, and extending into the Chuperbhita 

 pass for some distance. In this part of the Damin-i-koh they cover 

 an area of at least six miles in width from the boundary.* 



From the Goomani Nulla in the Chuperbhita pass, the eastern 

 boundary of these rocks passes in nearly a right line to near Kur- 

 matanr, where they are covered up by the sandstones of the coal- 

 bearing group. 



North of Kurmatanr, they again cover a large area within the 

 Damin ; stretching from this with an irregular outline to the west of 

 of the Hurra coal, and skirting the remarkable hill of G-undesree to 

 the "West, they pass northwards with a slightly curved boundary 

 into the district of Munni-haree. 



Independently of this large area occupied continuously by these 



* An excellent little map of this district will be found in Journal Asiatic Socie- 

 ty of Bengal No. VII. of 1851 accompanying Capt. W. Sherwill's paper. 



