138 NERBUDDA DISTRICT. 



system of joints which in one place seems to be most prominent, becomes 

 subordinate or quite effaced in another, and many more observations 

 will be necessary before any thing really satisfactory can be stated on 

 this subject. 



(a) Sub-Kymore Group. 



In 1854 while making a hasty examination of part of the Rewah 

 district, and passing from the Singrowli coal field on the south of Sone 

 river, towards the north, Mr. H. B. Medlicott found a series of beds of 

 considerable thickness intervening regularly between the sandstones of 

 the Rewah plateau and the ordinary crystalline metamorphic rocks. 



These beds, underlying the sandstones of the Kymore range are litho- 

 logically strongly contrasted with them, as also with the metamorphic 

 rocks to the south : these consist of clay slate and schist or shale, more 

 or less indurated and even sub-crystalline in places, interstratified with 

 thin-bedded fine grained flag stones, sandstone, and laminated quartzite : 

 to this group from its position under the Kymore range, the name 

 " Sub-Kymore" was given. 



Now in the north eastern portion of our map just such a series is 

 ~E dN E f J bb 1- f° un d> an d situated, as above described, between 

 P ur - the metamorphic rocks and the Yindhyan sand- 



stones. To the north-east of Jubbulpur the Mahadeva beds* over- 

 laid by trap, are faulted against the more gneissose schists, and against the 

 granite there associated with these rocks, (see map^. If a line be drawn 

 from that boundary in a north-west direction, up to the boundary of the 

 Vindhyan rocks, it will, after traversing the schists above mentioned, cross 



a considerable area occupied by rocks similar to 

 Boundaries indistinct. . 



those to which the name Sub-Kymore has been 



given. No section has been found which shows the junction between the 



* Name will be subsequently explained. 



