COUNTRY NORTH OF THE SON. 139 



the boundary remains practically rectilinear, the strike being parallel 

 to the foliation of the gneiss. 



North of Maraich the Mahadevas again came in contact with the 

 boundary whose faulted nature is here very clear. It runs along the 

 crest of a tall ridge whose southern slopes consist of Gondwana rocks 

 of the Mahadeva type, while the northern portion is made up of a 

 totally different rock which has been variously described as "quartz 

 reef,'"' " jasper/' {t hornstone-breccia, ,, and the true nature of which 

 has not yet been made out. It often coincides with the Gondwana 

 boundary, but may be only a coincidence, due to the fact that the 

 Gondwana boundary itself follows the direction of foliation of the 

 gneiss, which is the general strike of all the other geological 

 features. 



The relation of the Gondwana sandstone with respect to this 

 siliceous rock is not one of ordinary superposition, for the dip does 

 not in any way coincide with the slope of the hill, instead of which 

 the strata lie nearly horizontal. The section here is such as is 

 represented in Fig. 16. 



mww^<m 



Tig. 16. Section north of Maraich. B, Barakars; M, Mahadevas ; H, Hornstone-breccia ; 



G, Gneiss. 



Unless we suppose that the rock has been deposited against a 

 pre-existing cliff, we are bound to admit that here again it is faulted. 



East of this hill of peculiar structure, the rocks in the high level 

 plain of Maoli are typical Barakars, often interbedded with carbona- 

 ceous shales ; they frequently lie horizontal, or if they have any ap- 

 preciable dip, the strike is quite at variance with the general strike 

 of the boundary. Here again a basic dyke runs along a portion of 

 the boundary. 



( 139 ) 



