98 HAVDEN : GEOLOGY OF TIRAH AND BAZAR VALLEY. 



culty, for the appearances of limestones of what are probably widely 

 different ages are frequently so similar, that any separation on litho- 

 logical grounds is unreliable, if not impossible, while, on the other hand? 

 the paucity of fossils renders any separation of the rocks on palaeonto- 

 logical grounds equally doubtful. The classification adopted in this 

 paper must therefore be regarded as merely tentative, and liable to 

 considerable modification, when the area involved has been studied 

 in greater detail. For although, owing to the nature of the late 

 expedition, I found only a small number of fossils, yet many beds 

 showed indications of their presence, and 1 have no doubt that a more 

 extended search, should such ever become possible, would result in 

 the discovery of a number quite sufficient for the identification of 

 most of the rocks found in this area. 



By far the greater part of the area consists of rocks of mesozoie 

 age, with tertiary beds in two places, Towards 



Age o! the rocks. , t . . 



the northern limit the mesozoie strata are 

 brought into abrupt contact with beds of an older type, which prob- 

 ably belong to the older palaeozoic systems. 



Chiefly mesozoie. 



The line of contact of the two series is undoubt- 



Junction between meso- . . . . 



zoic and palaeozoic beds : edly the great fault, the existence of which had 

 already been predicted by Mr. Griesbach in his 

 paper before quoted. 1 



South of the Safed Koh the strata fall under 



Geological sequence. ■ . ..... 



the following Sub-divisions ;— 



8. Nummulitic limestones overlying ...... 



7. A great thickness of greenish and red shales, with buff sand-f p 



stones and subordinate limestone bands; all underlain by C 



grey limestone • ••..'.,.*- 

 6 and 5. Limestone, chiefly grey, with sandstones, shaley> Cretaceous and Juras- 



limestones and calcareous shales . . . . .) sic 

 4. Great thickness of dark grey massive limestones, with occa-> p , . 



sional carbonaceous bands, and, at the base, red shales .) * 



3. Red gritty shaleg, passing down into finer beds, then grits > 



and conglomerates, overlying reddish-brown needle shales J s * 

 2. Schistose slates and altered limestone . Carboniferous 



I. Much altered rocks, chiefly indurated and banded slate) 



and white quartzite j-Prob. older paUeozoie. 



' Rec, XXV, p. 88. 

 ( 98 ) 



