378 JOURNAL, BOMBAY NATURAL HISTORY SOCIETY, Vol.XII. 



We will first examine the deposits on Bhujia Hill. The following are the 

 only two sentences in Mr. Wynne's memoir which give us his description of 

 them : — " To the eastward from beneath the highest summits, the basalt is 

 underlaid by, and intercalated with, a rapidly increasing mass of soft (?), 

 ashy, sandy rock of greenish-yellow colour, passing in places into a hard sili- 

 ceous trappoid sandstone of coarse texture, containing fragments of woody 



plants From Bhujia to the conical sandstone hill on which Soorul 



temple stands, and near the latter, the subtrappean grits are occasionally seen ; 

 the trai)pean blotches and interstitial portions weathered out into little 

 cavities on the surface of the rock, which sometimes occupies pockets or 

 wide fissure-like spaces in the underlying Jurassic"! With this description I 

 am in perfect agreement ; but tie accompanying map and section do not 

 correspond to it, and I am at a loss to understand them. It will be seen that, 

 beyond calling some of the rocks " ? ashy " and " trappoid" and speaking of 

 " trappean blotches," the author speaks of nothing but grits. It is true that 

 in some parts they are so much and so irregularly discoloured, apparently 

 by infiltration, that they then bear a superficial resemblance to some rocks 

 of volcanic origin, but their essentially gritty nature is unaltered. 



The best exposure is on the northern slope of the hill, where the section 

 shown in fig, 3 is seen. Here the bulk of the hill is composed of the Jurassic 

 sandstones, which on the western side rise up and meet the capping of basalt. 

 East of this junction there comes in rapidly a series of thick beds of very 

 porous character, all of which are laminated, but not conformably to the 

 base on which they lie. Their porous character gives them a very "ashy" 

 appearance — that is, the appearance of fine debris deposited in the open air ; 

 but they are almost entirely composed of sand-grains lying in a loose matrix 

 of finer dust, and are so like some of the samples of subrecent concrete that 

 without labels they can scarcely be distinguished in hand-specimens. The 

 larainfe run up to and meet the basalt above, and as we pass eastward the 

 deposit becomes thinner till the basalt and Jurassic sandstones come together 

 a^ain. The other patches referred to as lying in the open hollows are gene- 

 rally darker and more compact, but they are still sandy. The isolation of 

 this and similar deposits at Khirgreea and Rhojla, its occurrence in a shelter- 

 spot on an old Jurassic hill, its porous character and sandy composition, — all 

 point to an ;volian origin, representing as they do the same (onditions as 

 those represented by the subrecent concrete. 



The second type of deposit at Sanosra,due south of Bhuj, and at Artara, 

 between the .Jurassic rocks and the trap, is simply a collection of stones 

 derived from the rocks below, cemented by finer material, and lying in 

 hollows over which the trap passes ; that is to say, it is the surface-debris of 

 the land on which the lava was poured out. 



1 Ob. cit. 1 . 168. 



