70 WYNNE : GEOLOGY OP KUTCH. [PAKT I. 



formed of theii- debris ; such ground is sometimes thickly covered with 

 a coating of agates which have also been found embedded in the ferru- 

 ginous lateritic roots of the neighbourhood. 



The sections- afforded by the sub -tertiary beds vary as might be 



expected at diflPerent places ; sometimes the white 

 Varying sections. 



beds are absent below, and the laterite rests upon 



the traps, the strong red color serving to distinguish it at a distance of 



several mUes, for the lateritie and hsematitic beds may be said to prevail 



wherever the group is found. 



Where the traps are present the dips of the sub-nummulitie group 



always coincide with their dip ; in their absence 

 Dips. 



the group generally slopes at low angles from 



the Jurassic ground ; but undulations, sharp dips, and anticlinal curves 



are also to be met with. 



The thickness of the band varies also; it seldom exceeds 200 feet, 



and sometimes is not more than 20. In the 

 Thickness. 



northern and eastern parts of the district its 



thickness is often much greater than along the southern side of the 



stratified trap hills. 



The relations between this and the overlying tertiary group are 

 obscure, the junction or transition often taking place among soft 

 gypseous or other shales ; and indeed where these are largely developed, 

 together with certain beds of dark ferruginous or coarse whitish grit, 

 it becomes a matter of extreme difficulty, when the traps are absent, to 

 separate the sub-nummulitie from the Jurassic rocks below or the tertiary 

 beds above ; while the appearances of absolute conformity to the Jurassic 

 beds on which they rest in the north-east part of the district for some 

 time induced the belief that they belonged to that formation. 



The group is not, as a rule, fossiliferous, or rarely so ; thick beds 

 forming one mass of matted leaves occur, but the only marine fossils, 

 which are doubtfully included in this group, are some few and not 



( 70 ) 



