OF DYNAMICAL GEOLOGY BAILEY. 187 



variety of folding, and through a scale equally various, is here 

 exhibited ; while the outline of the coast, distinguished by long 

 projecting tongues of land and intervening narrow valleys or 

 fiords, affording natural sections, make their examination 

 unusually easy and attractive. The erosive action of the sea, as 

 modified by the unequal hardness and the varying altitude of 

 the beds, together with the positions, equally various, of bedding 

 planes, cleavage, joints and fault planes, is also strikingly 

 -exhibited. Upon the coasts of Queen's and Shelburne Counties 

 the rocks are either Cambrian quartzites and slates, or granite, 

 and the former are generally, though not always, titled at high 

 ang^s, the result of orogenic movements of which the date has 

 not as yet been definitely fixed. A characteristic example of such 

 tilted beds is to be seen on Lockeport Island, not far from the 

 point exhibiting the glacial furrows already described. The 

 ledges here exposed are composed of quartzite, dipping 40 or 

 50, while the parallel troughs by which they are separated 

 correspond to the softer and more easily removed slaty beds. A 

 feature of additional interest in the case of this quartzite ledge, 

 is the fact that, notwithstanding the metamorphism of the 

 quartzite, which glistens with scales of mica, its surface shows a 

 number of unmistakeable impressions of what have elsewhere 

 been described as fossils under the name of Asteropolithon. The 

 real nature of these impressions, however, (which may be well 

 studied in the quartize ledges on the summit of the hills over- 

 looking Bedford Basin,) whether really organic or only imitative 

 forms of concretionary origin, is still disputed. If of organic 

 derivation, (and some of the markings seem inexplicable upon 

 any other view,) they probably represent the burrows arid the 

 radiating trails of marine worms. 



While the southern coasts owe their peculiarities largely to 

 the general presence of Cambrian quartzites or of granite, those 

 of Yarmouth and Digby illustrate, in an equally striking way, the 

 results of upheaval and of marine erosion where the prevailing 

 rocks are >lates. The most remarkable exhibitions of the effects 

 due to these two causes are to be found about Point Fourchu, 

 (Yarmouth Harbor), in the vicinity of Chegoggin Point, thence 



