Antioch Dunes National Wildlife Refuge--Docent-led public tour Saturday, September 10, 10 AM to 11 AM MDAS Coordinator:  Hugh Harvey Antioch Dunes is the only unit of the National Wildlife Refuge system in Contra Costa County.  It was set aside for two plants and a butterfly; Contra Costa Wallflower, Antioch Dunes Evening Primrose and Lang's Metalmark […]