STRATIGRAPHICAL FEATURES. lg 



defined prismatic outlines, and the granitic nature of the rock is 

 apparent. 



The eastern boundary of this spread of granite runs along the 

 foot of the main scarp of the Aravalli range in the district of Godwar 

 and it does not appear to extend into the hills. The boundary is 

 probably a faulted one, but it is always concealed by debris from tho 

 hills. It was mapped by Mr. Hacket as gneiss, but he seems to have 

 been in some doubt as to its true character and relations with the 

 true gneiss of the Arav-alli system. 1 



3. The Malani Volcanic Series. 



After the intrusion of the coarse granite of Erinpura just described, 

 a considerable length of time must have elapsed during which both 

 the schists and granites were folded under enormous pressure and after- 

 wards largely denuded before the next series of rocks was deposited 

 upon their upturned edges. Only one instance has yet been dis- 

 covered of a visible junction between the schists and the overlying 

 bedded lavas. 



The section is exposed in a valley lying about two and a half miles 

 to the south-west of the village of Miniari and seven miles north of 

 Chanod in the district of Pali 2 It is mentioned by Mr. Hacket, 

 who says that "a small thickness of red shales dip under the Malani 

 porphyries; but I am unable to say if they are Arvalis or not. These 

 hills are quite isolated in the plain ; the nearest hills of gneiss are 

 at Kaunla, about eight miles to the south, and the nearest Arvalis 

 about eighteen miles to the south in the large hills north of Erin- 

 pura," 3 A diagrammatic representation of the section is given in 

 fig- 4, PI. I. 



The floor of the valley is occupied by reddish slates or shales which 

 are either vertical or have a very high dip to the south-east. The 



1 Rec Geol. Surv. Ind., Vol. XIV, Pt. 4, p. 298. 



2 Rajputana Survey, Sheet 115. 



3 Rec. Geol. Surv. Ind, Vol. XIV. Pt. 4, p. 302. 



( '9 ) 



