1 18 MIDDLEMISS : THE GEOLOGY OE 1DAR STATE. 



directly penetrating the more mountainous parts of the country 

 where the Delhi Quartzite is in force. Although it is probable that 

 the granite is younger than the Delhi series, only one or two doubtful 

 contacts of it with the quartzite can be recorded near the margins 

 of the latter. It is probable that lack of penetrative power in the 

 granite is the main reason for this, whereas it had much less difficulty 

 in forcing its way through the lower-lying parts where the more 

 permeable calc-schists and other thinner-bedded, foliated rocks 

 may be presumed to underlie the alluvium. 



As already stated it is certain that the same rocks arc continued 

 far away beyond the limits of Idar State, westwards and north- 

 wards into the neighbouring States of Baroda and Palanpur, and 

 probably beyond that to join up with the Siwana and Jalor granites 

 of llajputana. In a south-easterly direction, oa the other hand, 

 the plutonic acid igneous rocks come to an end some distance before 

 the boundary of Idar State is reached. 



The exact defining of the relationship between the granite and 

 the rocks through which it has been intruded 

 Relation to surround- su ff crs like a great manv of the geological 

 questions m Idar, from the fact that the ever- 

 present alluvium and the wind-borne deposits cover up all the 

 low-lying lands and so bury the bases of these granite hill- masses, 

 and for the most part hide their junctions with the older rocks 

 through which they presumably penetrate. 



Apart from special and rare accidental sections which do show 

 such a relationship, there is every reason on general grounds to 

 predicate an extremely discordant relationship. The actual out- 

 crop ■ areas and their general distribution entirely favour the con- 

 clusion that the intrusion of this igneous rock happened subsequently 

 to, and quite independently of, the period of folding of the surround- 

 ing calc-gneiss and its injection by vein aplite, etc. The absence of 

 any special orientation of the group outcrop areas and the shape 

 of the individual areas (which are, as one might say, entirely 

 irregular) warrant the above conclusion. 



Of the few clear sections illustrating this relationship of the 



granite to its surrounding rocks one is 



Asai-Ya>na hill- f urnishe(1 ))V thc [ft^ J ul l mar ked bv the 



two villages Asai and Vasna, and lying 4 

 miles S.W. of Vadali. The hill stands up entirely isolated in the 

 midst of the alluvial plain, but shows its N.W. and S.E. extremities 



