NORTH SYDNEY AND SYDNEY MINES, C. B. — DeWOLFE. 301 



near the railroad, one mile east of ISTortli Sydney Junction, 

 with a dip 25° E. There appears to be no bedrock here; but a 

 large boulder Avas found, thrust up above the ordinar}- level, 

 and its strata in the attitude described. 



A dip section, to be accurate, would run northeast and 

 southwest, with a curve southward in the western part. 



Coal Measures. 



Contact strata. — Although the boundary between the two 

 formations have been placed at Stubbart point in maps liereto- 

 tofore published, there are many strata of coarse sandstone 

 above it, and several small coal seams below. The sandstones, 

 are, however, not so massive as those in the lower group, and the 

 however, not so massive as those in the lower group, and the 

 coal seams outcropping on the coast are unimportauit as regards 

 thickness and amount. The boundary has been placed, then, 

 where a change occurs from beds prevailingly arenaceous to 

 beds prevailingly argillaceous ; and while its exact position may 

 be a matter of debate, its general location may be regarded as 

 established. 



From tlie shore at Stubbart point the contact follows a 

 more or less arbitrary line northwest to Little Bras D'Or lake. 

 It is roughly traceable by a line of large sandstone boulders 

 which are scattered in profusion over the ground, and whose 

 presence has been attributed to the greater wearing away of the 

 softer argillaceous rocks of the Coal Measures, and the conse- 

 quent breaking down of the harder and topographically higher 

 Millstone Grit. Conclusions here, however, must be based 

 largely upon conjecture, as no exposures are to be found inland. 

 On the geological map of the Survey (Xo. 134) the boundary 

 curves considerably. This, and the curving of the coal seams, 

 would be due largely to the basin-like structure, but also in part 

 to topographic differences. Since the beds dip northeast at a 

 low angle, rising ground would extend horizon outcrops notice- 

 ably to the southwest. The surface rises rather suddenly from 



