The Clinton erratic is a greenstone boulder with north-south glacial striations, at the corner of Conrad St and Berg Road above the ferry terminal in the town of Clinton.
Clinton erratic (mapcarta.com) Clinton erratic is a stone in Island, Washington. Clinton erratic is situated nearby to the park Clinton Beach, as well as near the passenger ship terminal Clinton Ferry Dock.
The [Clinton erratic] rock and Coupeville’s Big Rock were used to calibrate 36Cl radiometric dating due to the well established date they were deposited and began to receive cosmic ray bombardment.