61 



Chapter 11.— Older Tertiary beds, including the Nummulitics. 



Rocks associated with nummulite-bearing beds have but a small 

 extent in the Nerbudda and Taptee country. 



Area and locality. • i i 



They occupy two isolated areas of no great extent 

 between those rivers near their mouths, and are also found in one or 

 two very small patches south of the Taptee. In every case they form 

 a fringe to the rocky trap country, and border the alluvium of Guzerat, 

 which conceals them to the westward. North of the Nerbudda they 

 have not been met with in the country mapped. The best sections 

 of them are seen in the Taptee near Gulla, and in the streams which 

 run from the Rajpeepla hill country to the Nerbudda north of the Keem 

 valley. 



The uppermost portion consists of gravels (in which a large pro- 

 portion of the pebbles are agates derived from 



Mineral character. 



the trap), sandy clays and calcareous sandstone, 

 frequently nodular. The gravels are often cemented into a con- 

 glomerate. Towards the base, bands of limestone, usually sandy and 

 impure, abounding in nummulites and other fossils, are met with, and, 

 with them, thick beds of a ferruginous clay, assuming, where exposed, 

 the well known brown crust, irregular surface and general appearance, of 

 laterite. Beds of agate conglomerate, apparently of considerable thickness, 

 still occur. These lower rocks are best developed near Turkesur and Gulla 

 and just north of the Keem, about Deenod, Whaliat and Wagulkhore : 

 further north they are not met with in so marked a form, but the 

 lowest beds about Amuljhur, Padwani and Seealee contain large rounded 

 blocks of trap. 



The enormous amount of trap debris, whether in the shape of 

 fragments of the trap itself, or of the rolled peb- 



Agates and other ma- , , „ i • i n • ' 



terial derived from the bles 01 agates derived from it, IS ample proof of 



• the great denudation which the traps underwent 

 during the deposition of the tertiary beds. Immense beds of agate 



( 223 ) 



