122 GEOLOGY OF ARE AX. 



mile from this point The dips are shewn on the figure 

 annexed (fig. 21). The name was applied by Murchison 

 and Sedgwick; but the relations of the strata were first 



Fig. 21. 

 Anticlinal Axis. 



pointed out by MacCnlloch. It is obvious, then, that 

 the strata are successively newer as we advance along the 

 shore towards Loch Ranza. We shall pass over their basset 

 edges rising southwards, the dips being northerly, and the 

 inclinations on the shore from 10 to 15 and 20; while 

 on the face of the hills above they are from 50 to 70 

 but in both cases alike towards the same point of the 

 compaM. 



The Old Red here is cut by several dikes, of which 

 two are extremely interesting. One of these is about half- 

 a-mile north of North Saunox burn; it entangles a mass 

 of altered sandstone, wedge-shaped at either end, five yards 

 long and seven inches thick; the range is nearly north- 

 west. The other dike is at the angle of the shore, where 

 the Fallen Rocks first come into view, at little more 

 than half-a-mile distant The dike is best seen in the 

 sand under the grassy bank. The structure of the trap 

 varies, much of it being a fine blue greenstone or basalt 

 The change on the sandstone is remarkable. The interlacing 

 of the two rocks, and intrusion of string-like veins of trap 

 among the sandstone strata, as forcibly attest as any dike in 



