Benthonic Algae — Scagel 
511 
TEMPERATURE (°C) 
10 10 10 10 10 10 10 10 10 10 10 10 
sediments which have participated in its fold- 
ing. Horizontal Miocene beds occur along some 
parts of the shore. 
General Features of Queen Charlotte Strait 
Along the mainland portion of Queen Char- 
lotte Strait (Figs. 1, 3) the rocks are chiefly 
Jurassic and intrusive, composed of granodiorite, 
chiefly quartz diorite. Parts of the island groups 
near the entrance to the Strait, including Hope I. 
and Nigei I., include some intrusive rocks sim- 
ilar to those on the mainland side, but the major 
part of the north end of Vancouver I. is com- 
posed of Triassic to Jurassic rocks. In this latter 
region argillites, lavas, tuffs, breccia, sandstones, 
and limy siltstones are common. A smaller por- 
