54 MIDDLEM1SS: GEOLOGY OF HAZARA AND BLACK MOUNTAIN. 



I have already described some thin interbedded limestones as 



occurring in the Slate series, e.g., the Lungu- 



CrystalHne limestone, r j a j band etc> ^s a parallel case there occur 



marble, etc. r 



similar bands of partly metamorphosed lime- 

 stone among the slightly schistose slates of the Gundgurh range, 

 Tanawal, etc. Near Chooean and Budda along the backbone of that 

 range there are limestones which it is almost impossible to classify 

 as belonging to the Slate series or to the metamorphics. They still 

 retain their dark grey colours and cryptocrystalline structure, but 

 they have become banded with paler-tinted layers, and they split 

 along certain directions displaying a semUschistosity of the same 

 nature as the associated slightly schistose slates. Some of them 

 again in the neighbourhood of trap-dykes, apparently intruded along 

 the bedding, have become blotched and traversed by calcite in patches 

 and veins. Some again Wynne has described as " puckered " 

 and " frilled," a condition very much resembling that of a contorted 

 mica-schist. Near Budda, and also near Bataura, —_. , there is a band of 

 white marble, and at Lalo Gulee grey and ochre banded marble occurs 

 among the schists. 



Whether taken as a whole or individually the above examples are 



perhaps sufficiently illustrative of the slightly 



Metamorphismofthe scn istose representatives of the Slate series as 



above rocks as a whole. " 



they occur along the south portions of the great 



schistose and gneissose area. The appearance in the field, as well as 



the study of the hand specimens, force the only conclusion possible, 



namely, that these incipiently schistose rocks are altered sediments 



of the same general composition as those forming the Slate series. 



Furthermore, the fact that a gradual transition from the one to the 



other takes place along the long axis of the Gundgurh range may be 



considered proof positive of the above conclusion. 



(2) Slightly schistose representatives of the Infra-Trias. 

 If further proof were still wanting that the slightly metamorphic 

 sub-zone of rocks to the south of the main crystalline masses are 



( 54 ) 



