178 



WT^NNB : GEOLOGY OF KUTCH. 



[PAET IT. 



This hollow is occupied by the soft sandy clay and gypseous shales of 

 the marine Jurassic group underlying compact flaggy sandstones. Near 

 the middle of the Surr are some great masses of compact, thick-bedded, 

 grayish-brown sandstone, with carbonaceous markings. A strong dyke 

 of basaltic trap is well seen on the western side of the Tullao, the re- 

 markable form of which is due to denudation of the softer beds. The 

 relative positions of the neighbouring rocks will be seen by referring 

 to the annexed sketch sections. In the superior Jurassic beds of the above 

 sections, further to the west, some fine specimens of PalcBOzamia, Sec, 

 were found near the village Chubruk, and again in the vicinity of 

 Loharea to the south-west — at both places in coarse ferruginous sand- 

 stone. 



Trap outlier near Katrol. 



Fig. 15.— Sketch section, north base of Katrol ran|»e, south of Boojooree. 



Westward of the large trap outlier already mentioned, a considerable 

 sized detached portion of the same bedded traps 

 is faulted against the superior Jurassic rocks, not far 

 from the eastern base of the Katrol Hill, the most lofty summit of the 

 range. This outlier has a gentle slope to the south by east, its thickness 

 increasing in that direction. It rests upon the higher beds of the upper 

 Jurassic group, also inclined in nearly the same direction at angles of 

 5° and 8°. 



The trap is of tbe usual dark basaltic kinds, often columnar, the 

 prisms being small; and the higher Jurassic rocks seen in the scarp to 

 the north consist of soft sandstones, parts of which are coarsely 

 ( 178 ) 



