134 KRAFFT: EXOTIC BLOCKS OF MALLA JOHAR. 



4«. Greenish and grey sandstones, alternating with shales. 

 Pass through green tuffaceous sandstones upwards 



into if 300' 



4<f. Hard, black, siliceous shales, passing through crumb- 

 ling shales into i,e ■ . . . . . 30' to 40' 

 4.C. Brown weathering sandstones, alternating with shales 10' 



4b. Black, crumbling shales ..... 200' to 300' 



4a. Red and greenish shales and red shaly limestones . app. 100' 



3. Gieumal sandstones ...... 400' to 500' 



The Gieumal sandstone becomes shaly in its uppermost layers, 

 weathering into long, pencil-shaped fragments. Above this follows — 

 4a. Near the base siliceous red shales of an intense terracotta colour 

 intercalated with a few bands of red hornstone and splintery 

 greenish shales. Higher up the shales become calcareous 

 and earthy, and thin bands of dense, somewhat siliceous, 

 greenish grey limestones appear. 

 This series is very conspicuous from a distance, especially so on 

 the hills to the north of Talla Sangcha E. G. No doubt it 

 corresponds to the " dense red earthy beds " mentioned by 

 Griesbach 1 from the flysch of the Chirchun area. 

 45. consists of black, crumbling alum shales, very similar to the 

 Spiti shales, but with some peculiar characteristics, such as 

 the occurrence of flaggy, brown weathering limestones with 

 many calcspar veins and of large, ferruginous concretions. 

 A negative feature consists in the entire absence of fossils 

 beyond plant remains frequently found in the flaggy lime- 

 stones. This division was also recognized by Mr. Griesbach 

 in the Chirchun area l and its resemblance to the Spiti shales 

 was pointed out, a few traces of belemnites being mentioned. 

 Its thickness cannot be accurately determined owing to the 

 disturbances it has undergone. 

 4c. is a grey, reddish brown weathering, micaceous, somewhat gritty 



sandstone in a few thick layers with shaly partings. 

 4,d. Hard black, siliceous shales, weathering rusty brown, traversed 

 by cleavage planes which produce cubical fragments. These 



1 Records, /. c, p. 21. 

 ( S ) 



