216 WYNNE : GEOLOGY OE KUTCH. [PAET 11. 



On the margin of the Runn, northward of some hills here, largely 



composed of the intrusive trap, a sinsle strong 



? "WallontheRunn." ^ _ rj o s 



sandstone bed, forming part of a horse-shoe-shaped 



synclinal contortion, projects on the flat ground and is supposed to be 



one of Colonel Grant^s '' walls on the Runn." 



Between the Manjal hills and the fine escarpment of Chapar 



there is a strong east and west feebly porphyritic 

 Tuksar. 



basaltic dyke, which at a place called Tuksar was 



said to have been the site of ancient mines where many metalloids were 



found. The place on being visited was not found to show traces either 



of mines or metalliferous minerals. 



The central plain between the gentle south and south-western slopes 

 of the long Chapar and Kaniri escarpment and 



Central plain south of 



the Chapar and Kaniri that of the stratified traps, is often sandy, but in 

 escarpment. 



places the rocks appear undulating, at its surface. 



Silicious, fault-rock-like reefs prevail as usual, running in various 



directions. An end view of one of these, mentioned by Colonel Grant, 



at the village of Guranee, and an oblique view 



Quartz reefs or ramps at ,t n -mt ^^ 



Gurauee and Malka, &e. of another strongly marked, south 01 Maika, are 

 annexed. (Plate V.) 



The latter, as is often the case with these indurated lines, presents 

 a false appearance of stratification outcrop, the true bedding in its 

 vicinity being either nearly horizontal or dipping gently south by west, 

 nearly in the direction of its strike. Other strong reefs occur in the 

 neighbourhoods of Koombree and Naithra. 



The rocks of the plain are of the usual upper Jurassic varieties, 

 such as are mentioned in the section beneath. 



At a little distance to the west-south-west from the village of 



Marine fossils near Guranee, a recess in the outline of the trap 



^'""'°^^- area is occupied by the upper jura beds, crossed 



( 216 ) 



