DESCRIPTIVE GEOLOGY: NUMMULITIC ZONE 



219 



Fig. 37 is a rough sketch of a block of Nummulitic limestone, 

 which is the characteristic rock element of this great and well- 

 marked zone. 



Fig. 37. 

 (4) Summary of the Nummulitic zone. 

 Taking a rapid glance over the Nummulitic zone as a whole we 

 may note — 



(1) That the sequence of formations is from Trias to Kuldana 



beds. 



(2) That the Trias, so far as we can see down into it, does 



not differ in any marked way from the Trias of the 

 southern parts of the Slate zone. 



(3) That the Jurassics present two well-marked types, a north- 



ern and a southern, and that though they pass into each 

 other, the line of passage is somewhat sharp and not 

 always recognisable ; also that whilst the northern 

 type is characterised by an abundance of Spiti shales 

 passing upwards into and overlaid by Gieumal sand- 



( 219 ) 



