Keywords: Anwr marsh creek.jpg en Photograph of oil-stained sandstone near crest of Marsh Creek anticline 1002 area http //pubs usgs gov/fs/fs-0028-01/fs-0028-01 htm USGS 2005 PD-USGov en wikipedia Arctic_Refuge_drilling_controversy United States Arctic Petroleum Alaska Arctic National Wildlife Refuge Geology of Alaska Petroleum in Alaska Energy in the United States |