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

Iceland (Wikipedia) Iceland (Icelandic: Ísland, pronounced [ˈistlant]) is a Nordic island country between the North Atlantic and Arctic Oceans, on the Mid-Atlantic Ridge between North America and Europe. It is linked culturally and politically with Europe and is the region’s most sparsely populated country. Its capital and largest city is Reykjavík, which is home to about 36% of the country’s roughly 380,000 residents. The official language of the country is Icelandic.

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.