BETWEEN BARODA AND tJDAYAPUR. 97 



variety, which may be called granitic porphyry. It passes into the flesh 

 red granite before described, in which granite chlorite often occupies the 

 place of mica, forming the protogine of Jurine. The felspar of the latter 

 rock is uniformly of a darker red color than that of the granitic porphyry. 



We next proceeded over a very bad road to Thanna, a BMl Paly 

 seven miles north-west of the last. The country presented the usual ma- 

 millary appearance of the lower granite tracts, but it was more broken 

 and rugged than I had heretofore seen, and was traversed by numerous 

 deep and narrow ravines. For the first three miles, the following rocks 

 presented themselves ; viz. the felspar rock, which I have called granitic 

 porphyry, which passes in some situations into gneiss and granite, both 

 generally of a redish colour. A granite composed of pure white granular 

 felspar — translucent quartz and silver colored mica, was also observed in 

 small quantity. Through this last garnets were sparingly interspersed. 

 These alternate with different modifications of hornblende rocks ; viz. horn- 

 blende slate passing into greenstone slate and primitive greenstone — the 

 alternating beds are from fifty to two hundred paces in breadth. We then 

 reached the bed of a nullah, with rocky banks, composed of a formation 

 exactly similar in appearance to the waved gneiss — it contains, however, 

 no mica, its constituent parts being hornblende, felspar and quartz — the 

 latter, in small proportion. I imagined at the time that this rock was a 

 distinct grey gneiss, and picked up several specimens of it as such. It 

 formed now the preponderating rock in which beds, but not of great extent, 

 comparatively speaking, of hornblende slate and greenstone were ob- 

 served, beds of red granite, and in one or two instances, of chlorite slate 

 were also seen. 



The above described rock exactly resembles the close grained grey 

 gneiss. It had a waved appearance, and it was only on reaching camp, 



B 2 and 



