298 THE STRUCTURE AND SUCCESSION AT 



" Millstone Grit." 



Successio7i. — For want of data based upon sufficiently wide 

 field study, the various formations are retained in this paper as 

 designed by Fletcher's map (Geol Surv. Can., Sydney sheet, 

 134), even though the reasons for delimitipg them in precisely 

 that way are not clear. Within the so-called " Millstone Grit," 

 the succession upward is as follows, ending on the east at 

 Stubbert's point : — 



coarse grit and conglomerate 500 feet. 



measures hidden 200 



conglomerate 5» 



fine laminated sandstone 10 



conglomerate 30 



sandstone 10 



conglomerate 2 



sandstone and arenaceous shale 115 



measures hiidden 1,000 



sandstone 400 



arenaceous shale 30 



conglomerate 5 



sandstone 300 



measures hidden 900 



coarse sandstone, in part a breccia 200 



underclay 2 



coal (Ingraham seam) 2 



shale and sandstone 41 



red marl 3 



conglomerate 8 



coarse sandstone 280 



fine " 100 



arenaceous shale 6 



sandstone 60 



4,209 ft. 



Conglomerates. — At the base of this formation, the texture 

 is on the average slightly coarser than is the case higher up. 

 Some strata grade into finer or coarser beds, but in most in- 



