Keywords: WestThumbGeyserBasin-Big Cone.jpg en West Thumb Geyser Basin Yellowstone National Park Wyoming with Big Cone annotated Screen Captured from NPS Website http //www nps gov/archive/yell/tours/westthumb/map htm with additional data added NPS Mike Cline 2009-02-18 PD-USGov Maps of Yellowstone National Park West Thumb Geyser Basin |