Big Cone is a geyser in the West Thumb Geyser Basin of Yellowstone National Park in the United States. Big Cone is a wide sinter cone that rises from Yellowstone Lake about from the shoreline. The vent of the cone is wide. At times of increased water level in the lake, the cone may be submerged completely. Big Cone is known to undergo rare eruptions 1 foot high or less. References Geysers of Wyoming Geothermal features of Teton County, Wyoming Geothermal features of Yellowstone National Park Geysers of Teton County, Wyoming