298 RECENT DEPOSITS OF NERBTJDDA VALLEY. 



are never seen, perhaps owing in part to its great permeability, but 

 mainly no doubt to the altered conditions under which it was accumu- 

 lated. 



With regard to the origin of regur no one who has examined any 



Itegur or Black Cotton portion of the Trap area in tBe vicinity of the Ner- 

 soil of western India. 



budda can entertain a doubt, any more than re- 

 garding the origin of the Trap pebbles so plentifully distributed over the 

 valley. It is apparently a deposit derived from the decomposition of Trap 

 rocks. Though perhaps modified to some extent in different quarters by 

 local conditions and the varied and mixed composition and characters of 

 the rocks in the vicinity, yet, whenever a sufficient expanse of level 

 ground occurs, within or near the Trap area, to permit of its accumulation, 

 there do we find regur under conditions which clearly point out its origin 

 from the decaying Trap rocks surrounding it.* 



The only pebbles ever met with in the regur, not of purely adventi- 



Pebbfca in the Regur. tioUS 0ri § in are a S ates > <l uartz and zeolites Such a& 

 are contained in the amygdaloidal portion of the 

 Trap rocks in the neighbourhood. 



* Mr. Theobald alone is responsible far this opinion. 



