BUNDELCUND. 3 



Westward, to the Tons and the Jurmohra, along the scarp where it is 



most abrupt, the rivers of the middle plateau flow over the edge in 



magnificent vertical falls of from 300 to 400 feet in depth ; beyond this 



point the separation between the outer and the middle plateau is no 



longer a mere scarp ; it is a ridge and a line of watershed, until at last 



the waters of the outer valley are carried through the deep gorges of 



the Beos and the Benk across this ridge, to be taken again along the still 



deeper gorges of the Kane through both bounding ridges. In a S. W. 



direction generally, the increased elevation of the Vindhyans is scarcely 



perceptible. Nursingurh is only 50 feet higher than Lohargaon, but 



Punnah also is a few feet above the same place, and the lowest ground 



about Buxwaho (on the outer ledge to the W.) must be some 200 feet 



higher than Nursingurh. The cause of all this is, 

 Cause. 



that on approaching a certain N. E. and S. W. 



line the Vindhyan strata take a rise ; the middle group has been less 



denuded, so that the outer ledge becomes contracted to a valley — the shaley 



beds of the Rewah group, which had a principal influence in forming the 



decided scarp, thin out along this rise, and become sandy — and thus the 



features and relative elevation of these two ledges become gradually 



transferred. 



I commenced work south of Allahabad; this point is noticeable. From 



here to the eastward the general run of the escarp- 

 Bearings of scarp. iip • 



ment is about E. W. ; while from here, in the other 



direction commences the N. E. — S. W. strike which will be shown to have 



an intrinsic connection with the original formation of the rocks. There is 



a secondary feature accompanying this change of direction, in the scarp : 



on the N. E. face of the angle, for a length of about 20 miles, the line 



of cliff has disappeared, the alluvium encroaches considerably, and one 



can reach the foot of the second step without any very marked ascent. 



It is along this slope that the Tons descends, conveying the drainage of a 



large area of the two lower ledges. 



