The bare slopes and steep sea-face tell of its basaltic formation, which gives perpendicular outlines to the jutting rocks against which, some six miles off, the waves are dashing heavily.
"Two Years in Oregon"
Wallis Nash
Its base is an almost perpendicular mass of basaltic rock overlooking the sea, at a height of 150 feet.
"In the Border Country"
W. S. (William Shillinglaw) Crockett
The basaltic structure is believed to be due to the contraction of lava consequent upon its cooling.
"Geology"
James Geikie