76 BUNDELCUND. 



center, besides sending out angular veins into the inclosing rock, which 

 is often modified at its contact. 



I saw but two varieties. A pure hornblende rock, rare, showing 

 when completely crystallized but the one earthy mineral ; such is the 

 dyke in the river at Banda. The other variety is a diorite or greenstone in 

 which the white and the green elements are perfectly separated, or else 

 mixed in any degree. I met with none porphyritic or quartziferous. In 

 structure and mode of decomposition they show great differences, there is 

 a granular diorite that might easily be mistaken externally for the crumb- 

 ling superficial ball basalt, other varieties have an angular, massive 

 structure and are very resisting ; at the foot of Bisram ghat, there are, 

 close to each other, examples of both these types. 



There are among the Bijawurs, diorites as massive, compact, and crys- 

 talline as any in the granitic rocks, and undis- 



Among the Bijawurs. . . *' . . . . 



tmguishable from them in aspect: this is a point 



in favour of there being true dykes among the Bijawurs; but there are 



varieties here which have no analogues among the subjacents, these are 



the fine, earthy, amygdaloidal and ash-like beds seen on Pandoah hill 



and in the Kane. I did not find these beds any where near the greenstones, 



and it may be difficult to determine their connection, if any, as the sections 



are bad unless when protected by the Semri sandstones ; there is little 



doubt of these earthy varieties being truly interstratified. 



With the igneous rocks I must notice the covering basalt. It and its 



associates form the only notable superficial forma- 

 The surface trap. 



tion: its outliers and promontories are found at 



many points of the area I have described, and give some interesting 



hints on the denudation of the Vindhyans. 



I have not to alter much the eastern limits of the great trap formation 



as pointed out by Coulthard and others, at least 

 Limits. . . '. , -iii 



m so far as it is characterized by the ordinary 



trap rocks It comes in at once in force and without much distinction of 



