•30 ROYAL SOCIETY OF CANADA 



heavy mass of trap or diabase along the west side, already referred to, 

 vhich in fact occupies the greater part of the island; and a series of 

 slates and conglomerate, which is found on the cast side and on several 

 islands off this coast. 



The rocks of this slate series are similar to those seen on the main 

 land near Letite. They are cut by large masses of green eruptives of 

 an older date than the trap ridge, and they are altered along the con- 

 tact. On the north end of the island one of these contacts is well seen 

 at Cameron cove on the south side of Fish head, where the slate adjacent 

 io the intrusive mass has become graphitized, and certain masses of 

 limestone in the vicinity are much changed in character. 



The eastern limit of the trap ridge at the north end of this 

 island is on the west side of Whale cove, the actual contact with the 

 •slates not being seen at this place. At Red head on the east side of 

 the island, a short distance north of Seal cove, there is a direct contact 

 between the trap rocks and the Silurian slates, the latter being altered 

 , for some distance from the junction. The slate rocks are seen on 

 several of the islands off the east coast, and axe altered to schists, re- 

 sembling strongly the rocks on Deer island and on Letite head. Masses 

 of felsite and diabase are common in this direction. All these slaty 

 rocks may now be classed as Upper Silurian instead of pre-Cambrian, 

 and as indicated on the published map. Traces of fossils can be seen 

 in several of the ledges along the shore, but the specimens are too indis- 

 tinct for detenuination. The presence of the Silurian on this island 

 is probably due to an anticline between this place and Deer and Campo- 

 bello islands to the west. 



The rocks of the Wolves group of islands, which lie about six miles 

 off shore from Bea.ver harbour, are for the most part granitic. There 

 are no means of ascertaining their age by direct contact with other 

 formations, but from the fact that they lie in the direct strike of the 

 pre-Cambrian rocks east of Beaver harbour, it is probable that all these 

 islands may represent an outlying portion of this series. 



The Devonian rocks of St. John and vicinity have furnished 

 material for discussion for many years. The shales and sandstones of 

 the Fern ledges, near Carleton on the west side of "the harbour, were 

 found by Hartt as early as 1860-61 to contain an abundant fossil flora, 

 which was carefully studied by the late Sir William Dawson, for many 

 years the leading authority on fossil plants in Canada. The horizon 

 of these rocks was definitely fixed both by the evidence of the contained 

 plants and from their stratigraphical sequence as beneath the Carboni- 

 ferous formations. 



