A Rocky Beach near Portland Bill 11 – Cobble-sized limestone boulder on the beach, showing the entrance holes of U-shaped tunnels formerly occupied by marine polychaete worms. Seen on an eastern shore beach of the isle of Portland, Dorset, U.K.
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A Rocky Beach near Portland Bill 11 – Cobble-sized limestone boulder on the beach, showing the entrance holes of U-shaped tunnels formerly occupied by marine polychaete worms. Seen on an eastern shore beach of the isle of Portland, Dorset, U.K.