1854.] Notes upon the Geology of the Bajmahal Hills. 265 



curs in the compilation and preparation of Maps, on which to record 

 the geological observations. Further, these Maps, being prepared 

 for special purposes, and seeking only to determine with accuracy 

 boundaries and contents (which they do most satisfactorily), are, as re- 

 gards the physical features of the country, quite insufficient in detail 

 for any careful geological examination. Of the interesting district 

 of the Damin-i-koh, all the topographical features were sketched 

 anew, and quite independently, as we proceeded. 



The examination of the many fossils procured, is still progressing, 

 and the final result of their comparison will be given hereafter, with 

 more detailed geological discriptions. 



The geological structure of the Damin-i-koh, is very distinct from 

 that of the adjoining district to the "West and South, although es- 

 sentially connected with both. 



The gneiss rocks, micaceous schists, hornblende rocks and schists, 

 and granite, which form the great area to the West, extend conti- 

 nuously into the Damin-i-koh, and pass under the more recent rocks 

 which there occur. Along the western flank of these hills, they 

 stretch with a very irregular outline, and extend for some distance 

 within the boundary of the Government territory. These schistose 

 and gneissose rocks are generally tilted up at high angles, in many 

 places much contorted, but on the whole (within this district) they 

 have a remarkably persistent direction and dip ; their foliation planes 

 striking from 25° to 45° East of North ; and the dip varying from 

 40° to 85° to the 1ST. W., occasionally they are perfectly vertical, and 

 in a few instances, the dip is reversed ; or to the South East. 



Associated with the gneiss, which is the prevalent character of the 

 rocks, are numerous beds of hornblende slates and rock, sometimes 

 of great beauty, the hornblende being of very dark bottle-green colour, 

 and highly crystalline, and the felspar of a pure white, or of a light 

 epidote green colour; numerous veins of largely crystalline, and 

 felspathic granite pierce through these rocks, and ramify between 

 and across the foliation. In many cases these veins are exclusively 

 composed of felspar and quartz ; the felspar generally of a pinkish 

 or flesh tint, the quartz of a dirty white. Frequently the mode of 

 arrangement of the crystalline masses of these minerals, produces a 

 beautiful and curious graphic-granite. 



2 N 



