33 W. BLANFORD, WESTERN INDIA. [PaET I. 



It, of course^ by no means follows that the same cause has influenced 



the direction of the foliation planes in Beng-al and in the Nerbudda valley. 



The subject still requires some further study _, and rather with the object 



of promoting such, than to express a strong opinion, it is well to point out 



, . , a few circumstances which, in the Nerbudda valley. 



Circumstances wmcii ^ •' 



tend towcards a different ^gnd towards showing that the gneiss foliation 

 conclusion in Nerbudda ^ ^ 



valley. there originated, not in bedding, but in cleavage. 



It has been already remarked that both the strike and dip of the 



lamination in the metamorphic rocks of the Ner- 

 Remarkable constancy 

 of strike and dip of budda are remarkably constant over large areas. 



Both near Baitool and about Hurda and Nimawur 

 the strike rarely diverges much from east-north-east to west-south-west, 

 while in the large tract between Chota Oodipoor and Bagh, it is equally 

 constant to a north-west — south-east, direction. In both cases it is gene- 

 rally vertical, and rarely dips at a lower angle than 70°. Nor is the 

 constancy of the strike and dip by any means confined to the small area 

 about Hurda, for the same is shown in Mr. J. Gr. Medlicott^s map 

 throughout the Nerbudda valley as far as Jubbulpoor, and in a MS. 

 report by Mr. Mallet, on the country between Jubbulpoor and Burwai, 

 the following sentence occurs : " The strike of foliation is pretty 

 constant throughout the gneissic area, very seldom exceeding the limits 

 of east and north-east ; the usual strike is east lO'-SS" north, the foliation 

 being, where observable, always close to vertical, I observed a single 

 doubtful exception ^ "^ ^ ■^ -^ . The bands of limestone and of schist 

 invariably lie parallel with the foliation." 



To the italicized portion reference will be made presently; the 

 remark is important, because Mr. Mallet^s work was entirely independent 

 of that which forms the subject of this report, although he examined a 

 portion of the same ground. The same remarks would not apply to the 

 metatnovpbic rocks in all parts of ludia. 



( l?i ) 



