spasmodic geyser in upper geyser basin, yellowstone national park, wyoming

area bacteria basin beautiful bison caldera countryside destination erupting eruption famous features field footpath forest geology geothermal geyser golden horizontal hot landmark landscape light microbe mud national natural nature orange outdoor park phenomenon place pool pools protected scenic spasmodic spring springs states steam sunset thermal thermophiles thermophilic tourist trail travel united upper usa vents walking water west wilderness wildlife wyoming yellowstone