136 Notes,, principally Geological^ on Southern India, [Jam. 



Worralconda, — From Nundidroog the road passes through Purniah 

 Cliatram and Wonalconda, along the easlern flank of the Nundidroog 

 chain, some spurs from which are crossed eti route. The Meta-Meyre- 

 cotta ranges he some miles to the right. The formation, asfiir as I was 

 enahled to judge from the examination of the spurs just alluded to, and 

 of some detached masses, and the appearance of the peaks of the highest 

 hills, is similar to that of the hill of Nundidroog. Several greenstone 

 dykes cross the plain, from west to east, between the two ranges. One, 

 close to Worralconda, has a northerly direction, I followed its course 

 some distance beyond the village, in the expectation of seeing it unite 

 with a large westerly dyke, of which I supposed it to be a branch, but 

 was disappointed by its dipping beneath the soil, and thus eluding my 

 search. Retracing my steps south of the village, I had the satisfaction 

 to see this surmise verified by its joining the main westerly dyke. As- 

 cending a large mass of granitoidal gneiss composing the Worralconda 

 hill, I observed another, but smaller dyke traversing the rock in the 

 same direction. This also joins the main dyke a little south of the hill 

 — it exhibits brass-coloured pyrites, and needle-shaped augite crystals. 

 Flanking the larger dyke, beds of both a red crystalline and compact 

 felspar occur, with quartz and thin veins of chlorite, as well as a green- 

 ish eurite which appears to owe its colour to epidote. This eurite gra- 

 duates into basaltic greenstone, like that of DeonhuUy. Magnetic iron 

 sand is obtained from the beds of the nullahs in this vicinity, and in- 

 deed, throughout the taluk, and smelted. 



Baugoopulli/.—The Nundidroog range appears to terminate a few 

 miles N. of this place, as the PoUa range on the right is approached. 

 Several trap dykes stretch across the plain, between the two ranges, 

 with an easterly direction. One of them a little to the west of the 

 deserted village of Mangsundrum, gives off branches to the north and 

 south. The latter throws off a vein, which, entering into a convex 

 mass of gneiss, spreads out into numerous, and occasionally inter- 

 secting, ramifications. About a mile south of Baugoopully the plain 

 is strewed with bits of ferruginous quartz, reddish felspar, with frag- 

 ments of a compact actynolitic vein: a little farther on, the latter is 

 seen in the bed of a nullah, partly lying in lamellar masses on the top 

 of weathered gneiss, and partly in thick veins, running a W. N. W. 

 direction, and having a dip of about 40^ to the south. Between it and 

 the gneiss, I observed a layer of a reddish felspar and quartz, varying 

 from half an inch, t© several feet in thickness. This frequently becoraei 

 veined with the lively green of the actynolite, and acquires a schistose 

 character. The actynolite rock, vice versa, imbeds crystal of a flesh- 



