I x. 



OUTI.IM 5 Ol I II I. D-,l <>LOGY 





II ilec -cptivc. In Fig. 25, for instance. the u>< If 

 really inclined at a high angle towards the left hand. Yet 



n merely at the surfn< c where they have leen licnt 



b.i< k (by the slide of rubbish down-hill, or by a grinding 



or other superficial agent) they might be sup- 



posed to be dipping from left to right. To be sure of 



the true angle and direction, we must not be content 







FIG. 26. Inclined 



t- the dip. 



exposed at a right angle 



with one small face of rock, but should go round a sec- 

 tion until we determine the point satisfactorily. A 

 of rock, for instance, seen from one side, as in Fig. 26, 

 may appear to be made of hori/ontal strata, which from 

 another point of view are found to be considerably in- 

 clined. The direction of dip will always be at a right 

 angle to the line along which the edges of the inclined 



