22 MIDDLEMISS: GEOLOGY OF HAZARA AND BLACK MOUNTAIN. 



Blaini conglomerate, and, so far as my memory and my notes 

 serve me, I am disposed to believe in the connection between the 

 Hazara Infra-Trias conglomerate and the Blaini conglomerate. It 

 may be mentioned that the conglomerate in Hazara, further north 

 than the typical locality of Sirban hill where metamorphic in- 

 fluences are beginning to tell upon it, has in many places more the 

 character of a conglomeratic slate, inasmuch as the matrix has been 

 hardened and the effects of cleavage go completely through the 

 rock. 



Into the wider question of the correlation of each and all of these 

 boulder-beds or conglomerates with the Talchir 



Talchir boulder-bed, ° 



Bacchus-marsh bed. boulder-bed of bouth India, with the Bacchus- 

 marsh beds of Victoria, Australia, and with the 

 Ecca beds of the Karoo system in South Africa, I need not enter, as 

 the question has been well threshed out by Mr. Oldham in the 

 Manual. 1 



(2) The lower sandstones and shales. 

 The basal conglomerate just described passes upwards into a 

 purple shale. The passage from the one to the 



Purple shales. r v b 



other is simply this, vis., that whilst the pebbles 

 of the conglomerate gradually diminish in numbers and size the 

 matrix persists to form the purple shales. 



The thickness of the shales is never very great, 20 — 30 feet at 

 Thickness. most, but it varies slightly as is natural. 



Passing into sand- The shales in turn pass upwards into a set 



of sandstones of considerable thickness. 

 The sandstones are of a deep purple colour as a rule, but they fre- 

 quently become white in their upper part when 

 The sandstones. 



the rock has a saccharoid appearance. The 

 texture of the rock is somewhat coarse. Bluish-grey chert veins 

 are sometimes found traversing the rock along joint and beddi v 

 planes. 



1 Chap. VIII, p. 198, et seq. 

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