MALLET, VINDHYAN SERIES. 89 



escarpment along the southern bank of the river, and is not less than 

 50 feet thick ; and owing to the very slight inclination of the beds along" 

 this valley, its outcrop is often two or three miles wide. Between it 

 and the limestone there is sometimes, but not always, a band of greenish- 

 grey and red shale. The general character of this sandstone is thin-bedded 

 and rather coarse-grained, with numberless little flat cavities parallel to the 

 bedding, from which clay galls have weathered out, or in which occasion- 

 ally the segregated matter is present. 



The Sirboo shales do not call for any special remark in this region, 

 being exactly the same here as farther to the east. Their junction with 

 the upper sandstone as seen near Summuna, three miles east of Dumoh, 

 is sharper than usual, the greenish-grey shales being covered by thin- 

 bedded dark red sandstone. 



To the west of Dumoh the outcrop of the lower Bundairs takes a 

 southerly turn, and the various sub -divisions may be traced as far as 

 Rehli, where they disappear beneath the trap. It is clear that their 

 outcrop is continuous imderneath that formation between Behli and 

 the Nerbudda valley, and we find them re-appear north of that river as 

 described above (p. 85). 



In the interval between the last mentioned localities and the 



^ „ country to the west of Gwalior, the Bundairs are 



Gwahor. '' 



as yet unworked. On comparing them in the 

 latter region with the same rocks as known in Bundelkund, several points 

 of difference present themselves, some of which are of sufficient impor- 

 tance to render it not improbable that further research to the westward may 

 necessitate more or less modification in the classification at present adopted. 

 From the north-westerly inclination of the Vindhyans generally, 

 thereabouts, the whole of the lower Bundairs may be crossed between 

 Bijapur and Mandrael, although stretches of alluvium prevent one^s 



obtaining an uninterrupted section. 



( 89 ) 



