Caution: The rocks of the intertidal are often covered with very slippery algae. Use caution and supervise small children. Hermit Crab at Stage Fort Park in Gloucester Northern Rock Barnacles at Preston Beach in Marblehead. Dogwhelk at Halibut Point State Park. Limpet at Halibut Point State Park. Orange-Striped Green Anemone and anurida maritima at Halibut…… Continue reading Rocky Shores / Rocky Intertidal Zone and Tidepools on the North Shore of Massachusetts