DESCRIPTIVE GEOLOGY : CRYSTALLINE AND METAMORPHIC ZONE. 24I 



on p. 247), Along the line of junction in a south-west direction 

 Edwards found a crystalline limestone in two or more bands, which ap- 

 pears to continue to about the " h" of Turbeluh in the Sirun river-bed. 



The next rocks exposed in the road section, after an interval 

 of river-gravels, are finely crystalline schistose slates, of pale colour 

 and shewing foliation surfaces filmed by mica. Then follow darker 

 schistose slate rocks with ramifications of quartz-veins through them. 

 They are considerably contorted on a large and small scale. Among 

 the first mentioned pale schists there are some bands of hornblendic 

 schists which may be foliated traps. They are in thin bands and 

 stand up resisting weathering more than the rest of the rock. Foliation 

 strike is about north to south and dip 50 — 6o°— 70 W. 



Due south of the "r" of Mehra and about if miles south-east 



■ • ' . . •_ of Turbeluh the section becomes of consider- 



Wynne s erratics ? 



able interest by the appearance of the first of 

 Mr. Wynne's so-called erratics. 1 I have before referred to these, 

 p. 45, and stated my belief that they are not erratics at all, but only 

 slightly displaced blocks, weathered out from an in situ vein. Such 

 a statement at first sounds like a terrible indictment against 

 Mr. Wynne's work, so in order to dispel such an idea I will at once 

 say that (as I shall prove in a moment) the position is a peculiar one, 

 a sort of geological puzzle, as if set by nature with the intention to 

 deceive. 



A little ridge-spur, running north to south on the east side of the 

 11 8 " of 2,198, descends to the road. Looking up this we see a con- 

 siderable amount of well-rounded river-boulders, a foot or more across, 

 and generally of /ens-shape — in fact exactly such as can be seen all 

 over the boulder-strewn plains of Recent deposits near Turbeluh, and 

 generally along the course of the Indus up-stream. But besides 

 these we may also see a considerable amount of gneissose-granite 

 (a rather fine-grained variety and without any noticeable porphyritic 

 crystals) in huge masses, much split up by weathering, and lying on 

 the spur and strewing the hill-side with fresh debris. 



With regard to this I made out the following points :— - 



(1) There were blocks of immense size, and all but the smallest 

 1 See Rec.G. S. of India, Vol. XII, p. 132, and section No. 3 accompanying the paper. 



R ( 241 ) 



