NERBUDDA DISTRICT. 225 



When the trap has been forced among those soft beds, some of which 



Dykes among soft mav be found in a11 tne sandstone group above 

 beds irregular. described the dykes formed seldom have their walls 



so rectilinear as when they cut through the sandstone beds. 



Fig. 13. Sketches shewing different forms of Intrusive dykes. 

 Fig. I3,a. Fig. 13,6. 



Fig. 13,a, represents a typical case of the habits of the dykes intruded 



among the soft beds, and is a sketch of one exposed in the Machiriva, 



Murrye Dyke in near Mun 7 e village. And Fig. 13,6. shows a cor- 



mud bed ' responding example of the angular and rectilinear 



form of outline of those which occur among the sandstones. 



In Fig. 13 ,a, the characteristic curved outline and numerous offshoots 



Soplye Dyke in Sand- ai ' e Wel1 shewn ' Man J cases occur in which these 



stone ' features are far more strikingly exhibited. , 



At the base of Latideo hill a fine dyke of porphyritic greenstone cuts 

 through the green mud beds of the Talcheer 



Dyke in Latideo hill. 



group, and is exposed in section on the vertical 

 face of a cliff. On this surface, and within the space of a few square feet 

 of it, thirteen small irregularly shaped patches of Trap were counted, 

 and it was at first supposed that they were fragments of the greenstone 

 embedded in the sedimentary rock. On examination, however, it was 

 found that each one was connected with the main dyke. By digging 

 away the surrounding Talcheer rock, it became apparent that some of 

 the patches, though showing a circular outline on the section surface, 



R 



