150 GEOLOGY OF THE SON VALLEY, ETC. 



quart zitic sandstone but thin-bedded or shaly sandstone and shales; 

 and secondly, near the typical section by Ramnagar, another range of 

 hills, less prominent and less high, occurs formed of shaly thin-bedded 

 sandstone and shales belonging to Zone IV; and we cannot be sure, 

 in the absence of organic contents, whether the chain of hills we have 

 traced from Raidooria and by Rampur, is formed of thin-bedded 

 sandstone which belongs to Zone IV or which is an extension, as 

 result of lateral change, of the quartzite of Zone III. 



The scarp referred to by Mr. Mallet as occurring near Ramnagar, 

 The scarp south of and trul y " rivalling in magnitude the Kymore 

 Ramnagar. range itself," is formed of this hard quartzitic 



sandstone of Zone III. This scarp sandstone probably does not 

 belong to Mr. Mallet's sub-division No. 8 as stated in the Memoir, 1 

 but really to his sub-division No. 6. For if the limestone band exposed 

 on the Nagour Nadi f mile south-east by south of " Khajuri" of map 

 is sub-division No. 7 limestone of Mr. Mallet's ( = our Zone V), these 

 beds forming the Kheinjua scarp, which underlie the limestone, 

 are necessarily older, and not younger. 



Zone IV. — These are the much ripple-marked shales (arenaceous 

 _; -, ■ . . . as well as argillaceous) that come above the 



Shales much ripple- => ' 



marked. quartzitic sandstone of Zone III, and are under- 



laid by a calcareous zone (Zone V). 



So long as Zone III is traceable, the lower boundary of Zone 

 IV is of course clear. But where Zone III is no longer definable, it is 

 not practicable to separate the thin-bedded sandstone and shales of 

 Zone III from those of Zone IV. The overlying calcareous zone (Zone 

 V) being however fairly persistent over a wide area, the upper bound- 

 ary of Zone IV is thus far better defined than the lower, and will be 

 best followed when the course of Zone V is indicated. 



Zone V. — This is a band of limestone with shales, and corresponds 

 to sub-division No. 7 of Mr. Mallet's. 



The limestone is, as a rule, very impure, being often brecciated and 

 . . cherty. A noticeable feature about this lime* 



Limestone npple- J 



marked - stone is its ripple-marked character, the ripples 



» Mem., Geol. Surv. Intl., Vol. VI L, p. 40. 

 ( 150 ) 



