MALLET^ VINDHYAN SERIES. 23 



the upper resting" imconformably on the lower, and being probably 

 equivalent to the Gwaliors or Bijawurs of Bundelkund. The lower 

 Vindhyans rest totally unconformably on the schists, which had been 

 upturned vertically, and greatly denuded before the former were laid 

 down, as will be seen further on when describing the Vindhyans them- 

 selves. The same schistose series is also largely developed on the south 

 side of the Nerbudda valley, and has been there described by Mr. J. Gr. 

 Medlicott.* 



The Bijawur series, consisting chiefly of Kmestones, hornstones, 

 quartzites and contemporaneous trap, has been reported on in Bundelkund 

 by Mr. H. B. Medlicott;t it will be imnecessary, therefore, to allude to 

 these further here, except to mention that the patches of Kmestone north- 

 east of Heerapur conjectured to belong to the lower Vindhyans, and 

 mapped as such have been found on more detailed examination to be refer- 

 able to the Bijawur series, with which, therefore, they are included in the 

 accompanying map. The trap also of the Bijawur area is, at least in part^ 

 contemporaneous. 



We find the same formation again in the Dhar forest, resting there, 

 as in Bundelkund, unconformably on the gneiss, and underlying the 

 Vindhyans. As remarked also above, it seems probable that fiirther 

 investigation will show that the ' slate series^ of the Sone valley includes, 

 amongst its contorted strata, beds which belong to a different and newer 

 series, representing either the Gwalior or the Bijawur. 



The Gwalior group is made up of silicious and ferruginous beds, 

 limestones, quartzites and contemporaneous traps, and imderlies the Vin- 

 dhyans with complete unconformity ; but the relations of these rocks to 

 the Bijawm'S, to which they bear some general resemblance, are as yet 

 unsettled. Both occupy a position between the gneiss and Vindhyans, 

 but they are widely separated geographically. 



* Vol. II, p. 130. t Vol II, p. 35. 



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