SEC. 11.] ABRASSA. 277 



At Roha, on the flanks of the hill surmounted by the fort, is a 

 quantity of sub-recent regularly bedded white conglomeritic concrete, 

 very thick and sloping from the hill ; it also occurs on the eastern 

 slopes of a larger hill close by, separated from this by a deep gap, and 

 it is worked in the neighbourhood for building purposes. 



The bases of both of these hills are of the ordinary basaltic flows of 

 trap of dark greenish colour, and columnar in the river course near 

 their foot. 



Resting upon this trap, as though perfectly conformable, is a 

 massive 30-foot bed of red hEematitic laterite, in places a pisolitic hsematite, 

 the smaller concretions of which sometimes weather out separately and 

 are used by the native shikaris as shot. It contains impressions of 

 woody plants. Over this is a 10-foot band of pink and purple alumi- 

 nous rock, with a peculiar columnar or prismatic structure, overlaid by 

 50 feet of buff and pink coarsely crystalline limestone, containing, and 

 in places quite full of, small NummuUtes. This limestone on the larger 

 hill contains some thorny spines of EcJdnoderms and very indefinite shell 

 fragments, 



A red laterite band surrounds this hill, and is traceable through the 

 neighbouring country between the tertiary rocks and the traps. 



CJdtrana Hills. 



The Chitrana hills are formed by an anticlinal curvature of the 

 stratified traps, the axis of which declines westward, and in that direction 

 bends horizontally towards the south. Denudation has excavated 

 deeply along the eastern portion of the axis, forming an irregular valley 

 among the lower flows, and leaving the highest portion of the hills 

 formed by the southern side of the anticlinal. 



In this valley the flows are chiefly amygdaloidal, including some 

 scoriaceous volcanic breccia, while the outer beds of the hills are of the 

 more solid dark basaltic varieties, the upper portions occasionally exhi- 

 biting a laminated or flaggy structure. 



( 277 ) ' 



