GEOLOGY 207 



Cape Granite is the northern boundary of the granite, which 

 retains the same character as far as Howe harbour. It is com- 

 posed of quartz, red feldspar and dark-green chlorite, and is 

 accompanied with gneiss of the same composition.' 



' The granitoid rocks extend across Peel sound into Prince 

 of Wales island in the form of a dark syenite, composed of 

 quartz, greenish-white feldspar passing into yellow, and horn- 

 blende.' 



ISLANDS OF GROUP IV. 



Archaean rocks are found only in the eastern part of this 

 group, on the large islands of Ellesmere and North Devon. 

 They rise from beneath the newer rocks on the south side of 

 Hayes sound a few miles north of Cape Sabine, and then 

 occupy the remainder of the eastern coast of Ellesmere and that 

 of North Devon. This area appears to form a wedge-shaped 

 mass expanding southward, so that on Jones and Lancaster 

 sounds they extend a considerable distance to the westward, 

 until they become capped by limestone, and then gradually sink 

 below the level of the sea. 



Both the Laurentian and Huronian divisions of the Archaean 

 are represented in the area. A series of bedded rocks consisting 

 of several thousand feet of sandstones, limestones and other 

 sediments occupies the coast and islands of the east side of 

 Smith sound, from Cape Atholl northward to Foulke fiord. On 

 the west side the northern limit of these rocks is Cape Isabella, 

 from which they occupy the shore of Ellesmere for upwards of 

 twenty miles to the south, the southern limit not having yet 

 been determined on that side. 



These bedded rocks are associated with dark coloured traps 

 and diabase, which are present in the form of sills between the 

 bedding; as dikes cutting the bedded rocks and as large intru- 

 sive masses. Dr. Sutherland classified these rocks as the 

 equivalents of the Tertiary sandstones .of Disko on account of 



