Valley (ifOodipoor. 6S 



quartz, greyish felspar, and hornblende, the last mineral being 

 80 disposed as to impart to the mass a distinct gneissy struc- 

 ture. It is a stratified rock, though the stratiform structure \n 

 somewhat obscure, and may be termed a sienitic gneiss. We 

 have then a succession of granitic rocks having the general cha- 

 racters above enumerated, and these, about forty miles to the 

 east of Meirta, gradually pass into rocks of the micaceous schist 

 series, of which hornblende schist, chlorite schist, schistose quartz, 

 and granular limestone, are members. These again are suc- 

 ceeded by argillaceous schists and quartz-rocks, which dip under 

 the newer sandstones of the north of Malwa. 



At and immediately to the west of Meirta, there occurs inter- 

 stratified with the gneisses and hornblende rocks a series of 

 granular felspars, occasionally containing minute grains of chlo- 

 rite or scales of mica. This rock is analogous to the Weiss stein 

 of Werner; but as its colour is as generally reddish as white, 

 the name is not very appropriate : in its texture it inclines to 

 schistose. It occurs more abundantly as we approach the hill 

 ranges which bound the Valley of Oodipoor, and is interstratified 

 with a translucent quartz-rock, which last is arranged in parallel 

 bars or plates separated from each other by minute scales of 

 mica. These can only be observed when the mass is broken in 

 a direction parallel to the slaty structure, and the quartz plates 

 are frequently so thin that the rock acquires a minutely fibrous 

 texture. Another variety of this rock has a specific gravity- 

 much higher than that of common quartz ; it is of a hght yel- 

 lowish-green colour, before the blowpipe is converted into a dark 



supplied are at Makmna on the borders of Jondpoor and Ajmeer. These I 

 have not visited. Besides the above, marble is found in many other localities, 

 as for instance near Saliimber in Mc^war, at Mungarwar to the west of Nee- 

 much, and near Jeypoor, but is not extensively worked. The yellow-coloured 

 marble which Bishop Heber saw at Agra, and which he terms Sienna marble, 

 is a secondary limestone from Jesselmere. It includes numerous minute 

 fragments of shells, and a particular variety has, at a little distance, exactly' 

 the appearance of the moss jaspers of Scotland. This rock Colonel Todd calls 

 " Jasper rock." It seems to belong to a secondary limestone formation ex- 

 tensively distributed to the west of the Aravulli chain, and which extends 

 from Jesselmeer into Guzerat. It is used in Calcutta as a lithographic stone, 

 and contains numerous organic remains of shells which have not as yet been 

 described. Several specimens are iu the Bombay museum. 



