78 BUNDELCUND. 



binary rock, the base is blueisli gray and, under the lens, has some- 

 what of a vitreous lustre, its texture is loose and minutely vesicular so 

 that the second mineral seems rather to occupy these pores than to be 

 an element proper of the rock ; however, the whole is so homogeneous 

 and constant, that this cannot be an adventitious mineral, it varies from 

 a dark amber color to a light greenish yellow ; it may be a variety of 

 olivine; this rock invariably has a spheroidal structure, breaking up 

 into balls of from three to five inches in diameter. These two varieties 

 do not preserve any constant relative position, either may overlie the 

 other: there are largely vesicular and amygdaloidal rocks belonging to 

 both types. 



The white calcareous deposit so widely associated with this great trap 



mi „ , , ,. formation, shows in most of these localites, and 



The fresh water lime- ' 



stone, generally as a base-rock; in this position the cal- 



careous element is often subordinate and the stone is brecciated and 

 conglomeratic; at Puturia I have it noted as, "a massive bed of 

 tufaceous, sandy breccia with geodes and seams of cherty and calcedonic 

 quartz," it is here at least fifty feet thick, but is generally very much 

 less. At Maltoun it is underlaid by a mass of amygdaloid. 



I did not find this bed with the trap of the low level at Mudunpoor or 

 None with trap of low Tingunnah, and I think I should have seen it if 

 there were any : the section at the former place is 

 " at base (junction not seen), forty feet of dense blueish, obscurely binary 

 basalt ; its structure is neither spheroidal nor prismatic, nor yet is it 

 quite irregular ; over it is a fifteen feet bed of a largely vesicular variety 

 of the same, and over this about twelve feet of the crumbling ball-trap: 

 one end of the dam forming the lake, rests against these beds and the 

 other on fine sandstones." 



There is another rock more closely associated with this trap series 



than is the fresh-water limestone just noticed; and 

 The Laterite group. 



more definite in its position — it is the rock-laterite. 



