CMAf. xi CLEAVAGE $* 



cleaved ilatc U overlain by a coarse, pebbly grit or 

 conglomerate, which has resisted the process of cleavage. 

 4. 53, (or example, the slates (a) might it a first 

 glance be mistaken for an older and entirely distinct 

 group of rocks from the grits (4) overlying them. But 

 further examination would probably disclose indica- 

 tions of lines of bedding running through the slates 

 parallel with those of the grits above, as indicated in the 

 diagram. Errors from this cause are so naturally made, 

 but so misleading in their effects, that too much caution 

 cannot be exercised to avoid them. 



