The rounded knob is made of the Shuksan Greenschist, a metamorphic rock that forms when high temperatures and pressures compress basaltic rocks.

also made of greenschist

Mount Shuksan

composition of

Oyster Dome

path on GitHub

https://github.com/davepinch/pinchy.cc/blob/master/content/topics/places/mountains/oyster-dome/wa100.dnr.wa.gov.snippet-geologic-story-2-2.md

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Hamersley Range (Wikipedia) The Hamersley Range is a mountainous region of the Pilbara region of Western Australia. The range was named on 12 June 1861 by explorer Francis Thomas Gregory after Edward Hamersley, a prominent promoter of his exploration expedition to the northwest.

snippet of

Oyster Dome (wa100.dnr.wa.gov) Take an invigorating hike up Blanchard Mountain, located south of Lake Samish, to the geologic treasure known as Oyster Dome—a rounded, rocky promontory with spectacular views of the San Juan Islands and the Olympic Mountains. Oyster dome is located in the 4,500-acre Blanchard State Forest, the only place in Washington where the Cascade Mountains meet the Salish Sea.

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