IP s t e I s i a 319 



a more shaly habit is seen in its structure and a 

 rougher, more forbidding aspect is presented in 

 its appearance. 



As the westernmost surfaces are reached on 

 the islands off the entrance of the bay, a shaly 

 habit is dominant in the rock of this formation; 

 huge dikes break through the shales and crum- 

 ple, twist and wrinkle them into many shapes 

 (Plate XXX). The even, monotonous strike and 

 dip are destroyed and a contorted slate is devel- 

 oped which curls and winds around the huge 

 dikes in many quaint forms and curves. These 

 rock masses may be followed by boat from one 

 rock island to another and along the precipitous 

 shore from the entrance of the bay to the dock 

 where rocks were first seen on our arrival at port. 



The culmination of this contortion is seen on 

 some small islands along the west side of the 

 entrance to Port Renfrew harbor (Plate XXXII. 

 fig. I.) An interesting intermingling of contorted 

 slates and intrudinsj dikes is soon found. On 

 this west side of the bay the slates disappear, 

 giving place to another and overlying formation. 

 West of Port Renfrew bay, not only dikes but 



