24 LA TOUCHE : GEOLOGY OF WESTERN RAJPUTANA. 



merate intercalated in places between the lava flows are sometimes 

 associated with tuffs, but elsewhere they are sandwiched in between 

 two flows of lava without the intervention of any finer material. 



4. Granites associated with Malani Series. 



Closely connected with the outpouring of the lavas there are other 

 signs of volcanic activity in the intrusion, both into the Aravalli 

 schists and the lavas themselves, of great masses of granite. The granite 

 is generally coarse grained, but not nearly so much so as the Erinpura 

 granite described above, and is lithologically of two varieties. One of 

 these contains quartz in abundance, pink or white felspar, and horn- 

 blende, but no mica. This is the " syenite " of Mr. Blanford. The other 

 variety contains the same minerals, but with the addition of mica. The 

 latter, which I have named the Jalor granite, since it is well developed 

 in the neighbourhood of that town, which is built at the foot of an 

 enormous boss of this granite, is confined to the eastern edge of the vol- 

 canic area, where it forms a succession of large bosses, either surrounded 

 by highly inclined Aravalli schists, or in a few cases in contact with 

 the lavas, in which it is seen to be intrusive. The other variety, with- 

 out mica, is confined to the interior of the volcanic area. It forms the 

 greater part of the enormous mass of the Saora range, south of Siwana, 

 rising to over 3,000 feet above the sea, and several other bosses formed 

 of it are found in that neighbourhood. I have, therefore, named it the 

 Siwana granite. It also forms several hills in the Barmer area, and it 

 is found to the south-west of that district on the borders of the 

 Runn of Cutch, in the Kalinjur hills of Nagar Parkar, where it has been 

 described by Mr. Wynne. 1 In the Barmer area the relations of the 

 granite to the lavas are not so clear as elsewhere, for although there is 

 evidence that the granite was intrusive in the lava sheets in contact 

 with it, the former is also traversed by dykes of a rock indistinguish- 



1 Mem. Geol. Surv. Ind., Vol. IX, Pt. I, pp. 48, 98. 

 ( 24 ) 



