148 



CONFORMABLE POSITION. 



north to south, may dip either to the east or west. In 

 other terms, as we have moved one 

 side of the cover of our book to the 

 right, we can move the other to the 

 left, 5, while the back of the volume, 

 a, a, still retains the same position. 



ANTICLINAL LINE. The anticlinal 

 line is that elevated central point from 

 which the strata diverge in opposite 

 directions. To represent it we have 

 only to extend both sides of our volume, 

 as in fig. 81. 



SYNCLINAL LINE. The synclinal line is the reverse of 

 the preceding, being the point at which the strata converge 

 towards each other. To depict it we have merely to turn 

 our book over, and open it only half way, exactly at the 

 middle, and the line between the two pages will present the 

 synclinal line, or that point towards which the strata incline 

 in the same direction. (Fig. 82.) 



FIG. 80. 



FIG. 81. 



The qua-qua-versal dip, is a term employed to express the 

 appearances presented when the strata having been elevated 

 into a boss, or dome-shaped protuberance, the summit of 

 the dome has subsequently been carried away, and the ground- 

 plan exhibits the edges of the strata, forming a succession 

 of circles or ellipses round a common centre. These circles 

 are the line of strike, and the dip, being always at right 

 angles, is inclined, in the course of the circuit, to every 

 point of the compass, constituting what is termed a qud- 

 gud-versal dip ; that is, turning each way. 



CONFOBMABLE POSITION. Strata are said to be conform- 



