66 LA TOUCHE : GEOLOGY OF WESTERN RAJPUTANA. 



of between two and three thousand feet above the sea. This is en- 

 tirely cut off from the Saora range by a broad belt of level ground 

 covered with sandhills. The rock composing it is mainly a strongly 

 porphyritic rhyolite exactly similar to that forming the large area at the 

 western end of the Saora range, and like it, weathering into rounded 

 masses closely resembling the granite. Some less porphyritic black 

 and red rhyolites, the former exhibiting flow structure, are exposed at 

 the east end of the range, underlying the porphyritic rhyolites, and with 

 these are associated thin beds of breccia. The inclination of the flows 

 is generally northerly, and the hills present precipitously scarped faces 

 to the south. Near the top of a pass immediately to the south of Dhira 

 is a band of a peculiar reddish coloured rhyolite containing large sphe- 

 rical concretions or sphaerulites an inch or more in diameter. The 

 same rock is found at the base of the range on the southern side 

 near Gogoji-ka-Than and extends for some distance to the west. Here 

 also some breccias are mterstratified with the rhyolites. 



Granite was found in only two places among the rhyolites of th:s 

 range, and in each case the outcrop is very small. One of these is at the 

 base of a spur a mile or so to the south-east of the village of Kundal, 

 and the other in a large valley to the south-west of Selo, about two 

 miles south-south-east of the Kundal outcrops. This granite is more fine 

 grained than the hornblende granite of the Saora range and differs from 

 it in containing mica. A similar granite but more coarse in texture 

 forms a detached hill about two miles west of the main range, close to the 

 village of Kanki, where it is also in contact with a small patch of rhyo- 

 lite. This micaceous granite is similar to that of which the large hill 

 at Jalor, several miles to the south-east, as well as many of the smaller 

 hills in that neighbourhood, is composed. 



A few miles to the north of the town of Chanod a range of hills runs 

 in a north east to south-west direction for about 25 miles, broken 

 through in the centre by the Sukri river, which runs north-west from the 

 Aravallis to join the Luni near Samdari. The range attains its greatest 

 elevation a!mcsfe»due west of Chanod where it rises to an altitude of 2,172 

 C 66 ) 



