GEOLOGY OF INDIA. 15 



and its superincumbent variegated or mottled variety, (called by Werner 

 bunter-sand-stein,) together with the deposits of lias lime-stone, place the 

 matter almost beyond a doubt. In using the term new red sandstone, how- 

 ever, it must be understood, as it is in England, to comprise all that series 

 of beds which intervenes between the lias lime-stone and the coal measures; 

 admitting which, he conceives that the water- falls of Bundelkhand, which 

 occur in the lowest steps of the Vindhya range, will afford a series of for- 

 mations corresponding perfectly with those of England; and to that 

 school, therefore, our attention should be directed, in order to arrive at 

 satisfactory conclusions regarding it. 



On the western side of India it is, as we have seen, covered by over 

 lying rocks, as 2it Sagar: it appears, however, flanking the large primitive 

 branch which rums to Udaypur, on the side of Guzerat ; and to the north 

 it sweeps into the desert to an unknown extent. A paper of Mr. Eraser's, 

 in the London Geological Transactions, proves this fact, even if we had 

 not the more substantial evidence of rock-salt, which is there produced in 

 abundance. 



The next of the great surface rocks of central India, is large-grained 

 ^TamYe, frequently passing into gneiss, generally composed of quartz, Jlesh- 

 coloured felspar, a little brown or black tnica and hornblende; it varies, how- 

 ever, in appearance, and also in the proportion of its constituents ; but, 

 generally speaking, it contains large crystals of felspar, and is, consequent- 

 ly, much subject to decomposition; Captain Franklin has specimens 

 shewing its unequivocal passage into green-stone, and, in some instances, 

 it resembles green-stone porphyry, as in a small water course at the foot of 

 the Sairamganj Ghat, in Bundelkhand: it sometimes also, he observes, 

 resembles euphotide, and, in many cases, it would be difficult to decide 

 whether it be granite or sienite; this circumstance renders it desirable that 



it 



