130 taXDLEMISS : Till-; CiJlOLOCiY OF IDAlt STATE. 



ridgelets completely surrounded by alluvium. At the outcrop 1' 

 miles south-west of Dharol town, and again at Vera on sheet 119 

 (Bombay Survey), however, a little calc-gneiss is exposed in contact 

 with the vein. 



Their geographical distribution is very simply stated by rc- 

 Dktribution, ferencc to the map. Beginning near Medh (a 



few miles east of Vadali) there is one small 

 hillock.. If miles N.byE. of Medh. This is followed by a short 

 ridge, 1 mile S.W. of Medh, on which the altitude number 822 

 appears. This strikes W.byN. pointing directly to the next out- 

 crop, G miles away and lying under the south end of the Dharol 

 hill, a short ridgelet marked 761. Thereafter towards the west, 

 west-south-west and south-west, there follows in close succession, 

 with from £ to 1 mile intervals only, a continuous string of these 

 ridges passing via Dobhara, Kambosana, and Wadtol to Vera. 

 Here the direction changes and the curve of outcrop returns on 

 itself via the 742 ft. ridgelet 1 J miles west of Wasan and the 753 ft. 

 hill I mile south-by-east of Hathoj. 



The general uniformity in width of these detached outcrops 



„ , .. (about J mile) from Dharol hill to Hathoj, and 



Probably a continu- j_i, • , • ■• , , , 



ous vein. their continuously regular outcrop that builds 



a single broken line of hills, makes it highly 



probable, that we are dealing with one continuous vein, partially 



obliterated by denudation or locally nipped out, and that extends 



through a distance of over 10 or 12 miles. 



Beyond Hathoj there are a closely placed set of three somewhat 

 irregular short ridges of vein quartz near Arsabda, and again one 

 small outcrop west of Lembhoi and north of Hani Tank and lying 

 north of the mass of granite surrounding Idar town. 



Far away from these localities there remains the little ridge 

 south of Nadn and U miles west of Adopodara, also the steep 

 little hill 1| miics N.W.byN. of Titoi (Tintoi). 



The ridges in section appear usually as small triangles with 



Field relations. Sfc6e f littlc sidcs > about 10 ° feet &igh by 100 



yards in width. It seems quite certain that 

 these quartz veins have no connection with the Delhi Quartzite. 

 They are not of the even, fine-grained texture of the latter, and never 

 show any structure that could be suggested as bedding. Although, 

 in one or two places in the Bamanvada area there are cases of some 

 difficulty, inasmuch as the veins appear to have invaded the Delhi 



