DECCAN TRAP. 



189 



while the fourth constitutes the hard capping 

 of the cotton-soil covered plateau to the 

 south-east, as in the accompanying diagram- 

 matic section. 



" In the higher plateau to the north- 



Bidar stands upon ^^st of Hoomnabad, Ye- 

 the highest flows. j^^j-^ ^^^^ ^.j^^^g ^^^ ^^^^^_ 



bly four more flows than those given above, 

 where the highest, on which Bidar stands, is 

 reached. The flows thus indicated are only 

 the harder and most distinct; there are 

 doubtless still many intermediate ones of 

 dolerite which are not so evident on the 

 steep slopes of the hills, owing to the softer 

 and more amygdaloidal flows between being 

 often of no srreat thickness.^^ 



Included minerals. 



The mineral substances enclosed in the 

 trap-flows are not very 

 numerous, less so indeed 

 than might be reasonably expected over so 

 vast and varied a tract. Zeolites are very 

 abundant in small or large vesicular cavities 

 in many trap -flows. They very rarely indeed 

 occur in drusy cavities of sufficient size for 

 the crystals to be made out by simple in- 

 spection. The most com- 

 Zeolites. 



mon zeolites are scolecite 



and stihbite. In one instance an uncom- 

 mon crystalline form of heulantide was ob- 

 tained in a purple amygdaloid occurring 

 atDandapur,9| miles north of Gokak. The 



( 189 ) 



