168 "WYNNE : GEOLOGY OF KUTCH. [PAET U. 



The country about Bhooj is particularly full of those long lines of 

 separation, which fault-like so frequently occur in the upper beds, and a 

 broken fault crosses the ground from east to west just north of Bhooj 

 city. 



Bhoojia Hill. 



The structure of this hill, Plate III, is somewhat complicated. Its 

 northern and western slopes are of the usual white and ferruginous sand- 

 stone, above which a sheet of dark basaltic trap with small crystals of 

 olivine occurs. From its position this basalt might either be a bedded 

 flow dipping to the south or an oblique dyke. It is highly magnetic at 

 several parts of the hill, deflecting the magnetic needle to an extent 

 which may explain the impossibility of making out the points given 

 as fixed here by the Trigonometrical Survey. 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 silicious trappoid sandstone 

 of coarse texture, containing fragments of woody plants. From a well 

 sunk inside the fort at one of the lowest points, a black variety of 

 this rock has been taken, showing a difierence in its vertical arrangement, 

 and its rather indefinite bedding, where traceable, is seen to be nearly 

 horizontal or to dip at low angles to the south, carrying it out over the 

 low slopes of that side of the hill. Where some steep spurs and small 

 peaks at the eastern and north-east sides of the fort occur, these are 

 formed either of the jvirassic sandstones, or of basalt and amygdaloidal trap. 

 Lines of fissure, and sometimes of fault, traverse the western sides of 

 the hill in more or less northerly directions, some containing ordinary 

 gray and others purple lava trap, as shown upon the annexed plan ; and 

 just near the gateway of the fort, the Jurassic and sub-trappean grits 

 are complicated by contortions and slips. On the slopes of the hill, too, 

 the intricacy of the relations are increased by the occurrence of patches 

 of subrecent concrete. 



( 168 ) 



