18G6.] the Western Himalaya and Afghan Mountains. 183 



28. Limestone, patchy blue and yellow ; argillaceous, 20 ft. 



29. Limestone, very argillaceous and having a pure lustreless grey colour, 

 and being striped on section, owing to bands of a lighter colour. The rock 

 is so compact and fine-grained that it resembles a fine greenstone in structure. 

 It is traversed by bands of rougher stone and also by bands of blue limestone. 

 It weathers rugose and pitted, 20 ft. 



30. Limestone like 28, 20 ft. 



31. Limestone like 29, 15 ft. 



32„ Limestone, as white as chalk, but hard. It is full of geodes like an 



amygdaloid, the geodes being filled or lined with minute crystals of spar. The 

 rock weathers in rounded bosses like granite or trap. It appears to have 

 suffered a metamorphosis. It is pi*obablo that the calcareous mud which 

 originally composed it was thrown into a bubbling condition by the infiltration 

 of heated vapours or the immersion of hot volcanic products into a shallow sea. 

 It presents no fossils or traces of fossils. The bed is not lenticular, but 

 extends regularly along the strike the whole length of the hill, being 

 conformable to the other beds, 5 ft. 



33. Limestone similar to 31, 5 ft. 



34. Marly, dark bluish grey and rough limestone, 5 ft. 



35. Like 33 again 15 ft. 



36. Hard and cherty limestone, pale grey or flesh-coloured. It contains 

 a few geodes like No. 32. It weathers pitted and rugose ; no 



fossils (?) 2 ft. 



37. Limestone like 34, 5 ft. 



The last three beds are a good deal denuded, owing to their being 

 at the top of the hill, which is narrow and barren. 



46. There can be no doubt of the Islamabad hill being composed 

 of AVeean limestone ; the argillaceous and arenaceous condition of 

 the rocks is exactly what we have seen in other localities where this 

 sort of limestone is developed. The fossils are very unsatisfactory, 

 being extremely comminuted. I have found, however, one Spirifera 

 and one Athyris which are to be seen in the beds at Weean. 

 I have seen also many sections and outlines of large bivalves 

 (Aviculo-pectens and unio-like Anthracosice) similar to those found 

 near Mutton. The Foraminiferce are also extremely numerous, 

 and the fossil shell which gives on the surface of rocks an outline 

 resembling a small pair of spectacles, is very common amongst 

 the debris of comminuted shells. The upper beds of the hill, 

 from 29 upwards, contain no fossils and have a peculiar appear - 



23 



