Il6 HAYDEN: GEOLOGY OF TIRAH AND BAZAR VALLEY. 



chlorite and some zoisite. Ilmenite is very common, in every stage 

 of alteration. 



The gabbrOy which I did not succeed in finding in situ> occurs in 



Gabbro. great quantity in the form of pebbles and blocks 



Not found iii situ. i n the stream-beds. The freshest specimen 



available contains much the same minerals as the Ghund Ghar dolerite, 



but in larger crystals. The plagioclase is labra- 



Microscopic characters. . ■ . . 



dorite, while the augite is a pale green variety 

 frequently twinned. It is partially altered to bright green horn- 

 blende, while the enstatite, which is either colourless or pale green 

 in this section, is frequently converted into bastite. 



V. — Summary. 



With the exception of the area lying between Chura and the Sur- 

 ghar Range, a complete traverse has now been made of the country 

 between Ali Masjid and the British frontier at Shina\vari. In this 

 area are found members of every system from the tertiary down to 

 the carboniferous, and probably silurian or older. 



The beds fall under the following sub-divisions : — 



Limestone, with nummulites, underlain by green and red) 



>■ Eocene. 

 shales and sandstones . . . . . . •' 



Grey limestones, with sandstones, .shaley limestones and) Cretaceous and juras- 



shales * sic. 



Massive coral limestone, — of the gorge between Bagh and ■» 



Dwatowi • . ....... } 



Red gritty shales, grits and conglomerates, underlain by ■» 



reddish-brown needle shales . . . . . . i 



Limestones and calcareous sandstone, with Productus Lime- 7 Permian to permo-car= 



stone fossils ......... ' boniferous. 



Greenish-brown shales, with flaggy quartzites and subordi- ■» Permo-carboniferous to 



nate bands of limestone and dolomite . . . . j upper carboniferous. 

 Altered limestones of Rohtas hill, Ghund Ghar and Surghar) 



Range {-Carboniferous. 



Hard banded slates and quartzites— near Sher Khel, Bara* (Probably) older palaeo- 

 Valley > zoic. 



Owing to paucity of fossils, much of the above classification is 

 merely tentative, but eocene fossils were found in Tirah, and ceno- 



( n6 ) 



