98 MALLET;, VINDHYAN SEBIES. 



group; secondly, it may include hotli sandstones, the Sirboo shales 

 being extinct; or thirdly, it may be the njpjper sandstone, the Sirboo 

 shales and lower sandstone being extinct. 



It will be seen from the map that in one place to the north-west of 

 Hoshungabad, the Bundair and Rewah sandstones are in contact. This 

 is owing to a small fault. As the highest beds of the lower Bundairs 

 are sometimes seen in contact with the Rewahs along the line of fault, 

 the throw must be equal to the thickness of the former sub-group, or 

 500 feet. 



The shales in the centre of the Dhar forest are covered by a sand- 

 stone which caps a line of hills along the north 



Dhar Forest. ^ ^ 



bank of the Nerbudda. If the shales be lower 



Bundair (p. 88) then the sandstone is probably upper. 



The upper Bundairs are found again to the south-west of Agra. 



They cap the escarpment which runs westwards 

 South-west of Agra. 



from Dholpur along the north bank of ' the 



Chumbul, but there only show a thickness of about 100 feet, a very 



small part of the entire development. The most compact section is from 



Jat-Araini east to the Kerowlee valley, where the lower Bundairs make 



their appearance. The Jat-Araini hill is about 200 feet high, of nearly 



horizontal sandstone, but from this point eastwards, the westerly dips 



gradually increase. At Araini the sandstone dips at 7°, at Madanpur 



at 10°. The section is three miles long, which, taking 5° as the average 



dip, would give a thickness of ... ... ... 1,440 feet 



and height of Jat-Araini hill ... ... 200 „ 



Total ... 1,640 feet 



The Futtipur-Sikri ridge is in places nearly 500 yards wide, dipping 

 at about 30° to south-east, which would indicate a thickness of 750 feet, 

 in which neither upper nor lower beds are included. 

 { 98 ) 



