140 



CUBVED STRATA. 



DISJOINTED STRATA. Fig. 62 presents a similar instance 

 of change in the direction of the strata, produced by a like 



cause, and displayed in the same region. Beds which at 5 

 strike in a southerly direction, on reaching the Malvern 

 syenite at a, are thrown into vertical and disjointed masses 

 at b* 



FIG. 62. 



CURVED STRATA. In other instances they are curved, as 

 is the case with the gneiss, at Oreby, Isle of Lewis, a deli- 

 neation of which forms the frontispiece to Dr. M'Culloch's 

 Western Isles (fig. 63). 



FIG. 63. 



