25 



MALLET, VINDHYAN SERIES. 



Somewhat beyond the Hmits of the map, about Seronj and Goonah, 

 and thence northwards towards Sipri, the trap is covered by immense 

 spreads of rock-laterite, which attains a considerable thickness, and rests 

 on the lower series with a perfectly sharp junction. Small outliers are 

 found for a long" distance to the eastwards, as on the top of the Bundair 

 escarpment above Dooreha, on Sirboo hill, and along the Punnah range 

 of hills as far as Simereeah, north of Rewah. It is frequently underlaid 

 by some yards of white and lilac clay, from which one or two doubtful 

 mammalian bones have been obtained, and which sometimes includes 

 segregations of brown hcematite, which is worked as iron ore.* 



The Gangetic alluvial plains run up to the base of the Kymore 

 escarpment from the debouchure of the Sone at Kotasgurh to beyond 

 Kallinjer fort, and again from the limit of the Vindhyans from Gwalior 

 northwards to Futtipur-Sikri, and thence for a long distance to the 

 south-west, until schistose rocks come in between. The Nerbudda allu- 

 vium is also found in contact in. the Jubbulpur and Hoshungabad 

 districts. 



In addition to the above, we may mention the blown sand-hills 

 which occur to the west of Agra, and increase in size and number as 

 we proceed westwards. In the hot weather the westerly winds, after 

 blowing across the great desert, come charged with sand. The heavier 

 particles are driven along the surface of the ground and become rolled 



Fig 1. Mode in which sand is heaped up against any obstacle. 

 or heaped up (Fig. 1) on the windward side of any obstructing hill. When, 

 as is often the case, the sand is driven into a gorge, or valley narrowing to- 



* Vide Vol, II, p. 78. 



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