220 WYNNE : GEOLOGY OF KUTCH. [PAET II. 



Section 10.— North-Western Kutch, including Gaira, Koond, and 

 Mhurr Districts. 

 The large intrusion whieli terminates near Nurrha is traceable 

 Great intrusion of westward for about 16 miles, forming eitber a 

 Western Kutch. narrow, but distinct ridge near otber billy- 



ground, or expanding into clusters of small bills, sometimes of very 

 complicated structure, tbe trap baving been intruded so as to overlie^ 

 or support portions of tbe sandstones, or to penetrate tbe latter in an 

 intricate tangle. One portion of tbe intrusion obliquely crosses tbe 

 axis of tbe anticlinal, wbicb affects tbe lower Jurassic group, but its 

 nortb-western extension irregularly coincides with the. general strike 

 of the strata south of the curve. 



Tbe trap throughout is mainly of tbe coarsely crystalline kind, 

 described as occurring in the ManjaV bills, and also in tbe Arrara intru- 

 sion south-east of Dbenodur. Some small outlying portions in its 

 vicinity are less coarsely crystalline and sometimes columnar. From' 

 its amorphous character, hills and ridges formed of trap have massive 

 forms, by which they may be distinguished even at a considerable 

 distance, and tbe intrusion sometimes ascends the flanks of tbe lower 

 Jurassic bills, with a certain appearance of conformity here and there, 

 as if tbe main fracture had run more or less along the planes of strati- 

 fication. 



Due west of the Manjal bills, near an isolated elevation called 



' Ahela' (alone) or AJclia, a very thick (30 to 

 hills and near Akela 40 feet) band of light colored coarse sandstone 



comes out from beneath tbe base of tbe Cbapar 



scarp and forms singularly craggy ground, the dips of tbe sandstone 



beino- in various directions. In a nullah here, some underlying greenish 



o-ray ' felted-looking' lumpy, nodular shales forming its bank are seen to 



( 220 ) 



