STRATA. 



51 



" conformable," which name is applied when the strata 

 follow their natural or regular succession, whether this 

 retains its horizontal position, or, as in fig. 4, assumes a 



FIG. 3. 



FIO. 4. 



FIG. 5. 



position more or less vertical, which frequently happens from 

 the subsidence of one part or the elevation of another ; but 

 they are sometimes found in the state represented in fig. 5, 

 and in which they are said to be " unconformable." Such 

 strata after having been tilted out of the horizontal have 



E 2 



