321 



Miometres Triassic area along the shore of the Bay of Minas 

 and 15 to 20 miles (24 to 32 km.) to the eastward, 

 are visible the hills of "Devonian" strata rising 

 on the southern side of the Salmon river valley, 

 beyond Truro. 



Where the railway enters the valley of Folly 

 river it turns to the north, and keeping to the 

 west of the stream, follows the valley north- 

 ward across the Cobequid hills. About where 

 the railway finally enters Folly river valley, it 

 crosses the northern boundary of the "Con- 

 glomerate series." All along this boundary, for 

 a number of miles to the east and west, the 

 lowest member of the "Conglomerate series" 

 consists of conglomerates holding pebbles and 

 boulders up to i foot (30 cm.) in diameter of 

 the bordering "Devonian" strata and of the 

 igneous rocks that penetrate the "Devonian" 

 and underlie by far the greater part of the area 

 of the Cobequid hills. The "Devonian" strata 

 in places have yielded plants precisely similar 

 to those of the Riversdale-Union group and it is 

 quite certain that the "Devonian" of the south 

 flank of the Cobequid is in part at least, the 

 equivalent of the Riversdale-Union group. 



The "Devonian" beds both to the east and 

 west of Folly river are traversed in an east and 

 west direction, by a zone of fissuring occupied by 

 veins of ankerite, siderite, etc., and masses of 

 limonite and hematite. These deposits for 

 many years were mined and the ore smelted at 

 Londonderry. 



The "Devonian" strata in general have been 

 metamorphosed to a considerable degree. 

 Quartz veins are common. In places the rocks 

 are schistose, and they are penetrated by various 

 types of igneous rocks. In these respects, they 

 differ from the strata customarily classed as 

 Carboniferous and therefore, notwithstanding 

 the palseobotanical evidence, Fletcher classed 

 them as Devonian. If the so-called "Devonian" 

 is not Devonian but is approximately of Mill- 

 stone Grit age, then the strata of the band of 

 "Conglomerate series" to the south may be 

 35063— 8a 



