BucUand*s Formation of the Valley of Kingsclere. 257 



116 



anticlinal lines (fig* . ^^ ^ ^ An ticUnai Line. 



116.), which define the ^-^^^^"^"^^^^"^ 



saddles of the strata,s 



or the meeting at the^ 



surface of their vertical 



angles. 



It is observed, that sometimes these lines follow the crests of 

 the chains of hills, as in /ig, 113., and sometimes pass along 

 the course of valleys as in Jig, 114. ; the hills in the latter case 

 being formed, not by the saddles of the strata, but by the 

 escarpments cutting through them. In the map of the Weald 

 denudation (j%. 127.) and of the Kingsclere valley {fg. 136.), 

 the anticlinal lines pass along the centre of those areas. 

 It thus appears that the direction of these lines is governed^ 

 not by the present superficial elevations on the earth's surface, 

 but by the points of intersection of the upraised edges of the 

 strata, whether upon a ridge or in the eroded bottom of a 

 valley. The annexed group (fg. 117.) exhibits (at a and b) an 

 instructive example of the opposite circumstances under which 

 the anticlinal lines are sometimes disposed, and shows a section 

 of the central deposit which those lines circumscribe. It con- 

 sists of part of the Mendip Hills section. 



Egar Hiil. 



Pen Hill. 



Old Med Sandstone. 



The following figure (118.) represents the fan-shaped strati- 

 fication, being the reverse of the saddle-shaped ridge. This 

 occurs in the mountain limestone at Daleberry Camp. 



Mendip Hill. 

 118 



Mountain Limestone. 



The hasin-shaped stratification, which is of continual occur- 

 rence in coal countries, is well exhibited in the succeeding 



