302 THE STRUCTURE AND SUCCESSION AT 



the harbor, and slopes from the divide gradually toward Big 

 pond, thus giving to the eroded edges of rock horizons a cres- 

 cent shape. 



Divergence of outcrops. — The separation of horizons at the 

 surface is noticeable from the harbor to Big pond. This is due 

 in part at least, to the differences in dip. On Sydney harbor 

 the dip is six degrees, while at Big pooid and Black point it 

 averages four to five. This difference in beds so nearly flat can- 

 not but have some influence upon the location of the outcrops 

 of two horizons between which lies a constant thickness of rock. 

 The same condition obtains south of the harbor, at Victoria 

 mines and southeastward. 



Succession. — Beginning at the lowest strata, on the east 

 side of Stubbart point, and going northeastward to the highest 

 rocks at Cranberry Head, the order is as follows : — 



ft. in. 



arenaceous shale 20 



marl and clay, wnth small coal seams 20 



underclay 2 



coal — 10 



sandstone 20 



shale 25 



coal (Stony seam; contains 6 inches of rock) 3 



shale 10 



sandstone 12 



shale 4 



sandstone 3 



shale 6 



impure limestone — 6 



red marl 10 



shale 30 



coal — 6 



shale 2 



sandstone 8 



coal 1 



argillaceous shale 20 



