DESCRIPTIVE GEOLOGY: CRYSTALLINE AND METAMORPHIC ZONE. 255 



ping N.N.W. — S.S.E., characterises the line of country from Tilli via 

 Ril, Naranj and Bukal to Najorian. There is then a narrow interval 

 of interbanded gneissose-granite and schists, and then follows a 

 second thick sill of gneissose-granite, similar to, but more 

 massive than, the last, and taking a parallel line from the west 

 scarp of Panjigali via Landai to a little west of the high crest (8,160 

 feet) above Kand. Trap dykes at certain places, especially on the 

 ridge west of 8,160 feet summit, interrupt the granite in parallel very 

 thin outcrops. The rest of the way up to the crest of the Black Moun- 

 tain ridge is over schistose rocks invaded and permeated by narrow 

 strings of the granite and by isolated crystals of felspar, but without 

 any very important bands of massive gneissose-granite. 



Inasmuch as the crest of the ridge from Panjigali takes a north 

 easterly course to Bampurgali, after which it again travels north- 

 or north-north-west, it is clear that the north-easterly trending part 

 traverses diagonally across the strike of these thin-bedded permeated 

 and injected schists (as described above). The highest summit of 

 the ridge, Akhund Bibd, 9,170 feet, caps the middle of this part of 

 the ridge and represents, as far as one can see, the top bed of this 

 great crystalline ascending series, which is here rather arenaceous 

 and with fine interpenetrations of the granite. For, east of that 

 summit, we appear to pass through a descending series of the same 

 order as on the west side up which we have come, and finally at 

 Bampur we arrive again at great massive beds of the gneissose- 

 granite, the representative of one or other or both of the Tilli- Ril or 

 Panjigali-Landai bands. This is plainly indicated on the south-east 

 slopes of the Akhund BSba* part of the ridge by the Bampurgali 

 band passing continuously via Sumbalbat, Kotli Maidan, and Rahim- 

 kot to Pabalgali, thus completing half an ellipse of outcrop. 



Below Rahimkot the strata turn over and dip in the opposite 

 direction. The long straight ridge going towards Thati and the 

 two long straight parallel ridges going towards the summit of 

 Bahingra seem to follow the general strike of the crystalline rocks, — 

 i.e., N.N.W.— S.S.E. 



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