COUNTRY NORTH OF THE SON. 133 



probable that the boulder slate is older than the true conglomerate 

 which runs to the north of, and nearly parallel with it. 



The crystalline area between Longitudes 82 and 82 30' seems 

 chiefly remarkable, so far as a very cursory 



Crystallines. . r 1 1 1 



examination shows, for the development of a 



very porphyritic gneissose granite, in which the longer axes of 



the crystals of orthoclase point in every direction, showing no 



tendency to parallelism either with each other or with the very 



obscure foliation. 



The Gondwana rocks in contact with the crystallines belong 



to the Damuda series and probably to the 

 Gondwanas. 



Raniganj stage. The boundary eastwards 



from Bichiadol is taken from Mr. Smith's survey. It is not possible 

 to make out from this whether the boundary is faulted or not. In 

 the eastern part of it the sandstones are described as resting un- 

 altered on the gneiss between Deosar and Deora ; further west, 

 between Pipri and Maoli, there is said to be a good deal of 

 alteration and induration at the contact. 



I have seen this junction at two places only. North of Ujainr 

 (a short way off the map) the bottom bed of the Damudas was 

 a breccia of quartz and felspar, evidently the debris of a pegmatite 

 of quartz and pink felspar which is intrusive in the crystallines close 

 to the boundary. The other place was near Bichiadol, where the 

 sandstones are found turned up to a dip of 70 to south by east 

 and are considerably indurated. It seems that the boundary is 

 faulted to near the Mohan and eastwards of that natural. 



The western portion of the boundary appears to be faulted and in 

 True nature of tms area there are two small outliers of 



boundary. Talchir rocks. The first of these which was 



discovered by Mr. Smith rests in unconformable contact on the 

 transitions in the valley of the stream flowing northwards from 

 the village of Tal to the Gopat. The second lies to the east of Tal, 

 and is bounded on the north by the crystallines and the south by 

 the Barakars. This country has been carefully examined by 



( 133 ) 



