188 



WYNNE : GEOLOGY OF KUTCH. 



[part II. 



Thickness of traps. 



Neighbourhood of 



Sairat. 



The thickness of the Deecan trap formation in these hills may be on 

 the average 2,500 feet, which is in excess of that 

 given by Mr. Blanford, as cited before, but the map 

 which he used was considerably out as to distances, and the rocks where 

 he crossed were much narrower ia extent than as they are exposed here. 

 Near the village of Sairat, about a mile west of Khirgreea, a slight 

 anticlinal curvature of the Jurassic beds is seea in 

 the neighbouring stream section, causing an ex- 

 posure of some beds lower than those which overspread the country 

 eastward. They consist of shaly clays with nodular bands, flaggy sand- 

 stones, underlying finely-laminated shales, with a few carbonaceous 

 streaks. The latter on the north side of the anticlinal appear to be 

 faulted against thfe coarse white grits of the upper group, which are 

 sharply contorted and abut against an outlier of soft infra-trappean grit, 

 here containing numerous fragments of fossil wood replaced by impure 

 carbonate of lime. Just south of the village it seems to be more trap- 

 pean in a small hillock which is capped by thick-bedded, black and red, 

 ferruginous sandstone. 



The lower portion of the hillock is traversed by veins or reefs of 

 tough calcareous grit, which has a glistening fracture. 



Further down the stream near Barapoor, the rocks are again much 

 disturbed and traversed by irregular dykes of purple and brecciated 

 lava traps, some of which do not appear to have reached the surface. 



Fig. 16.— Lava dykes in bank of stream soutli of Sairat, 



( 188 ) 



