NERBUDDA DISTRICT. 127 



both these groups, and especially of the latter, renders it difficult to 

 conceive how the immediately subjacent beds of the Schists could have 

 been within the reach and influence of granite intrusion subsequently 

 to their deposition without the effect having extended to them. As 

 however only a small portion of the Vindhyan and Sub-Kymore area has 

 as yet been examined, we may fairly expect that any doubt which for 

 the present remains will be hereafter removed. 



Although we may be thus not quite certain whether the granite may not 

 possibly be subsequent to the deposition of the Vindhyan sandstone, there 

 can be no hesitation as to the relative age of the Talcheer group which 

 comes next in ascending "order. Its lowest beds contain many fragments 

 of several varieties of the granite rocks, and the source of these can in 

 many instances be traced to masses, the remains of which are still seen 

 in places. Moreover these lowest beds of the Talcheer series not un- 

 frequently rest on denuded surfaces of the granite itself (see below Fig. 7). 



To resume then, we find that the granite ^all belonging to one geolo- 

 gical period) is certainly subsequent to the schists, that it is probably 

 anterior to the deposition of the Sub-Kymore rocks, and almost certainly 

 anterior to that of the Vindhyan sandstone, and finally that there can be 

 no question as to its being older than the lowest Talcheer rocks. 



In each of the localities above described, as illustrative of the fact of 

 the disturbance of the schists by granite, it happens that many trap- 

 dykes are also found : these cut through both schists and granite veins, 

 in all directions, sometimes running along the side of the latter, or paral- 

 lel to them, sometimes passing across them and traversing the schist 

 beds also, sometimes parallel to the bedding lines ; and, where these are 

 obliterated, parallel to the planes of lamination, and often obliquely or even 

 at right angles to these.* 



* By lamination-planes we understand simply more minute bedding, often among these 

 schists scarcely distinguishable from subsequently induced foliation, but really due to ori- 

 ginal deposition. It is a phenomenon almost always more or less distinctly traceable in 

 every sedimentary rock, even in the most homogeneous sandstone. 



