DESCRIPTION OF SECTIONS. 221 



demarcation be drawn between them, and the slates are nothing 

 more than the shales altered by dynamic metamorphism. Similar 

 slates will be described in other regions occupying large areas, and 

 with intercalated limestone bands full of nummulites. 



Along the western edge of the principal range, where it borders 

 upon the desert, and where, owing to various 



Fault or fissure. .... 



indications, it seems probable that there runs 

 the outcrop of an inverted fault or overthrust, there exists a feature 

 which has been variously described as a "fault" or "earthquake 

 crack." It is quite conceivable that it should be related to the pre- 

 viously existing inverted fault. 



The Siwaliks shown in section, Fig. 3, continue southwards 

 with a very constant line of strike, more or less 



Siwaliks. 



concealed at times by recent deposits. They 

 form a remarkably rectilinear line cf conspicuous low hills across the 

 Nushki plain, and south of Nushki separate into two branches. The 

 eastern branch continues southwards along the south-west strike 

 of the main range ; the western branch strikes south-west and marks 

 the commencement of a long series of Siwalik ranges which may be 

 followed westwards for a great distance, fringing the southern 

 borders of a range of older rocks which will be described further. 



The strata usually dip at about 40 in an easterly direction. 

 They consist of bright red conglomerates, interbedded with sand- 

 stones of various colours. Lower down the section, the sandstones 

 are interbedded with clays of various colours, pink, white, green, and 

 purple (yV^)- Rif ts and caverns in the beds of conglomerate running 

 at right angles to the strike have been filled with a curious calcareous 

 breccia frffc). 1 



All along the foot of the main range is an enormous talus spread- 

 ing into the plain of the stony desert. The 



Talus formations. 



portion north of Nushki was mentioned when 

 dealing with hydrography as an illustration of the considerable 



1 These and similar numbers are those of the Register of the Survey Collections. 



( 43 ) 



