242 NERBUDDA DISTRICT. 



Nerbudda valley, have nowhere been found resting on Vindhyan beds, 

 even whei'e, as is sometime the case, these come within 12 or 15 miles 

 of the boundary we are now describing. If the Vindhyan rocks ever 

 stretched thus far to the south of their present boundary, they were 

 Original extension of a11 removed P rior to the deposition of any of 



the Vindhyan rocks. these Wer f orraat ions. It certainly seems extremely 



improbable that such a formation had an original coast line so straight 

 as its present boundary, and it is difficult to escape the conviction 

 that the beds of this series must once have stretched farther to the 

 south than 12 or 15 miles from their actual limit in that direction : this 

 conviction, moreover, is strengthened by the absence all along the 

 Vindhyan boundary of any thing like shore deposits. 



It has been shown that in the cases of the Mahadeva group, ample 

 indications of the old coast line exist, where the faulted boundary coin- 

 cided or nearly coincided with it. No such indications have ever been 

 detected along the Vindhyan boundary line, every thing, on the contrary, 

 suggests that the very homogeneous rocks found along that line, were 

 formed under the same conditions with the vast spread of similar deposits 

 extending over Bundelkund and Rewah. 



From these two considerations, namely the rectilinear direction of 



n i • 4 j the boundary, and the fact of its certainly not 



Conclusion suggested •> ' J 



by these considerations. be ; ng t ] ie original limit of the basin of deposit 



of the formation, we come to the conclusion that it has been determined 



„ _ L . „ , . by a great line of fault. But the observer in the 

 Confirmation of this J ° 



conclusion. g e ]^ w jj[ have this conviction forced on him by 



evidence of the fact that the line we are describing is itself, at many 

 points along its course, a fault with a down-throw to the north. We 

 shall now instance some cases where this is well seen. Near the junction 

 of the Hiran River with the Nerbudda, both east- 

 wards along the right bank of the former, and 

 westward along the right bank of the latter, many fine and instructive 



