Postelsia 345 
quartz grains sufficiently to compact and develop 
crystalline masses. It is quite obvious that the 
concretions have been formed since the rock was 
accumulated. Locally wherecalcium carbonate 
was abundant it has involved nearly the entire 
material of the formation. In this ‘way the 
rugged rock masses of Postelsia point and its 
immediate neighborhood have been hardened 
into enduring outposts along a rocky shore. 
Animal and plant remains have been factors in 
the hardening process. Remains of turtles, 
molluscan species, and many fragments of ligni- 
fied wood and seaweed are found in these hard- 
ened masses. Segregations of plant remains 
occur when hardened rock masses are broken. 
That they yielded both carbon and oxygen for 
the hardening process seems quite clear. 
In looking across the Straits of Fuca when 
the air. is clear, snow fields are seen upon the 
Olympic mountains. They terminate in long- 
tongued glaciers slowly flowing down through 
the valleys until they are lost in tumbling 
streams. The question occurs: Were there ever 
such snow fields and glaciers around the Seaside 
