28o 



laiomerrts Along the shore, at intervals, occur patches of 

 the Limestone series which seem to lie along the 

 continuation of the synclinal axes that traverse 

 Boularderie island to the north. 



Approaching Grand Narrows, cliff faces in 

 gypsum are visible on the opposite shore. 

 28-3 m. Grand Narrows — At Grand Narrows the 



45-5 km. railway crosses the strait, about 650 yards (590 

 m.) wide, connecting Little Bras d'Or lake with 

 Great Bras d'Or lake. These two salt water 

 lakes extend southwesterly through the centre 

 of Cape Breton and almost divide it into two 

 islands. The combined lakes have a length of 

 60 miles (96 km.) and an area of 360 square 

 miles (935 sq. km.). Long bays, continued 

 inland by low valleys, are a feature of the lakes 

 and these with other characters indicate that 

 the lake basin, in part at least, represents a 

 system of drowned valleys. 



After crossing the bridge at Grand Narrows, 

 the railway for a few miles follows the northern 

 shore of Great Bras d'Or lake. Inland rise low 

 hills of the Carboniferous Conglomerate series, 

 while along the shore occurs a comparatively 

 narrow zone of the Limestone series, the strata 

 dipping southerly with angles of 15° to 40°. 

 Cuttings in red conglomerates, shales and 

 gypsum occur along the line of railway for about 

 four miles (6-4 km.), to where the railway line 

 leaves the shore. In a distance of a little over 

 one mile (i-6 km.) the railway again touches 

 the shore at the head of McKinnon harbour, 

 a winding narrow bay about 3 miles (4-8 km.) 

 long. 

 34-6 m. McKinnon Harbour Station — Inland from 



55-5 km. McKinnon harbour a low, hilly country under- 

 lain by gypsum and the associated strata of the 

 Carboniferous series, extends northwesterly for 

 about 4 miles (6-4 km.) to the shores of the 

 St. Patrick channel, a long (25 miles or 40 km.), 

 narrow, irregular bay extending southwesterly 

 from Little Bras d'Or lake. St. Patrick channel 

 is mainly bordered by areas underlain by the 

 Limestone series, but along the northwestern 



