GENERAL STRATIGRAPHY, 



43 



Dupchn?^ nl}^ 



n!>^JZfohyu£p'j 'nf9^ 



^uiodxjauno'j '^^^ 



ftuyio&ryYpg \\ 



sented in the figure (3) : at the outer edge of 



the hills the highest beds of the series have a 



dip of 40° to the south ; a short way up the 



river^ they have become horizontal or flatly 



- undulating. Where these beds are last seen, 



a above Salagaon^ they have a steady rise to 



^ the north. The next rocks have more the 



8 character of the nimamulitic sandstone ; they 



'^ have a high southerly dip. Ryak Lamapkra, 



i a little higher up, is on a ridge of such a 



-S sandstone, probably a repetition of the same 



^ beds, having a moderate dip; and in the 



I valley of Eyak Ujanpkra the nummulitic 



g limestone is at the surface quite horizontal ; 



.J it runs so up to the base of a steep ridge, 



I and here turns up abruptly along the surface 



g 



jg of the cretaceous sandstone ; — a bend exactly 



^ like that on the Bogapkni. The cretaceous 



;J coal occurs along the north flank of this 



S ridge. After a short blank section the same 



52; cretaceous sandstone appears along the river^s 



'^ edge, having a very low northerly inclination, 



•J which brings down the limestone again, 



a resting on the sandstone. A quarter of a 



^ mile further north, close to Seju, both rocks 



|. tm-n up in a similarly abrupt manner against 



,02 



fj; the base of the ridge of gneiss. The ridge 

 north of Eyak is the best example of the 

 first point indicated at the commencement 

 of this paragraph, — of the features which 

 suggest a compressing force from the south .; 



( 193 ) 



