November 23, 2017: In Easterbrook’s book, “A Walk Through Geologic Time From Mt. Baker to Bellingham Bay”, he says that “volleyball-sized” chunks of Dunite from the Twin Sisters range can be found in the Middle Fork of the Nooksack River at the Mosquito Lake Road bridge crossing. There is a parking area and access to the river on the southwest side of the river. If you are heading south on Mosquito Lake Road from the Deming area, the parking area is on your right immediately after you cross the one-lane bridge. See the aerial view below with a P for parking.