280 Br. Voysetfs Private Journal [No. 4. 



Close to the base of the hill on which the instrument is fixed, a rock 

 is broken in half by some convulsion and discovers two rounded masses 

 of a very micaceous granite, differing remarkably from that in which 

 it is contained, with very distinct edges, and intersected by two 

 or three veins of granite similar to that of the containing rock. In 

 one place the separation or slight adhesion of the two surfaces has 

 allowed the rounded pieces of micaceous granite to fall out, leaving a 

 hollow, such as is seen in a sandstone breccia, or pudding-stone, where 

 the decomposition of the cement has bared the surface of the contain- 

 ed pebble, or angular mass, and allowed it eventually to fall out. I 

 have long suspected that I should at least be able to prove to a cer- 

 tain extent that these masses which I have observed at Seeporty, at 

 Nelgondah, Secunderabad and in other parts of this district are of 

 anterior date. I have called it a crystalline micaceous green-stone, it 

 is however, so small grained that I cannot now discern in it any horn- 

 blende, I shall therefore, consider it a very micaceous granite of a 

 dark grey colour. My reasons for considering this granite to be of 

 anterior date to that which encloses it are the following. 



1. Its defined margin which distinguishes it from those veins of 

 quartz and felspar in granite, which generally pass from one substance 

 to the other by insensible degrees. 



2. Its very different composition, the one being principally mica 

 and quartz of a small grain rendering it very black and tough, the 

 other an aggregate of quartz and felspar of a fresh colour and in 

 rhomboidal crystals with a very small quantity of mica. 



3. Its rounded appearance, as if it had been previously subjected 

 to the action of some mechanical cause rounding its angles. 



4. The veins of granite of the same nature with that of the con- 

 taining rock and running from it through the mass. 



In the immediate neighbourhood of this singular rock is a vein of 

 the common greenstone, or rather an irregular mass without any trace- 

 able direction, since it disappears at a short distance, apparently con- 

 cealed by the debris of the granite. The granite has the aspect of 

 having suffered violent disturbance, immense masses being strewed on 

 all sides of the rock abovementioned. 



Near to the hill station is a very remarkable hill of about 500 feet 

 in height, its tops consisting of tabular granite ; its southern aspect 



