Strawberry Spit (also Sanctuary Island) is a small artificial island in the San Francisco Bay's Richardson's Bay

embayment A bay is a recessed, coastal body of water that directly connects to a larger main body of water, such as an ocean, a lake, or another bay. A large bay is usually called a gulf, sea, sound, or bight. A cove is a small, circular bay with a na ...

of Strawberry Lagoon. It is still referred to as Strawberry Spit, although it no longer is technically a spit. Historically the spit was a haul out area for

harbor seal The harbor (or harbour) seal (''Phoca vitulina''), also known as the common seal, is a true seal found along temperate and Arctic marine coastlines of the Northern Hemisphere. The most widely distributed species of pinniped (walruses, eared se ...

s. A channel was built separating Aramburu Island from the mainland to isolate and therefore protect the seals from human disturbances. The landscape north and landward of Strawberry Spit is dominated by Ring Mountain, whose slopes are strewn with a multitude of boulders that include minerals such as mica, amphibolite and

eclogite Eclogite () is a metamorphic rock containing garnet (almandine- pyrope) hosted in a matrix of sodium-rich pyroxene (omphacite). Accessory minerals include kyanite, rutile, quartz, lawsonite, coesite, amphibole, phengite, paragonite, ...

.C. Michael Hogan (2008) ''Ring Mountain'', The Megalithic Portal, ed. Andy Burnha

References

Islands of San Francisco Bay Islands of Northern California Islands of Marin County, California Mill Valley, California {{MarinCountyCA-geo-stub

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References