MALLET, VINDHYAN SERIES. 91 



From this hill north to the Chumbul,, a distance of eight miles, 

 nothing but the alluvium is seen. 



On the right bank of the Chimibul a small patch of fine white 

 sandstone is exposed, and on the other bank the Bundair limestone is 

 seen, obviously higher in the section than this white sandstone. 



Whether the Bundair limestone seen in the Chumbul and under the 

 Dholpur scarp is the same limestone as that of the Jhilalgurh hills, is a 

 matter of some doubt. From the above section one would be inclined to 

 consider them the same. The sandstone and shales above the limestone at 

 Jhilalgurh are very similar to those above the Bundair limestone at Sewar ; 

 resting on the limestone in both places is sandstone, then a few feet of red 

 and purple shales and then a loose sandstone with pebbles of quartz. We 

 have seen how flat the rocks are in the Jhilalgurh hills, and on the north 

 side there are even some southerly dips, so that judging from this section 

 alone one would probably conclude that the limestones are identical. 



An examination of the same strata near Sipri, however, where 

 a more complete and continuous section is obtainable, throws much doubt 

 on this identification, and indeed renders it more than probable that the 

 two limestones are distinct. In passing west from Sipri, after crossing 

 the upper Rewahs, one obtains a fine section of the Gunoorgurh shales 

 up to the Jhilalgurh limestone. The Jhilalgm-h scarp is here nearly 

 600 feet high, the limestone of the lower part being capped by a consider- 

 able thickness of sandstone. The latter dips from the edge of the escarp- 

 ment at an angle of about 3° to the north-west, and is exposed 

 continuously to within four or five miles of the Chumbul. On the right 

 bank of the river a very similar sandstone presents itself covering 

 which on the left bank the Bimdair limestone is seen. The interval 

 between the Jhilalgurh sandstone and that seen in the Chumbul 

 is occupied by alluvium, and it is here that the only imcertainty 

 in the section arises. There may be a reverse (south-east) dip 

 between these two points which would account for a repetition in the 

 M ( 91 ) 



