- Fountain Geyser -shoot water out of a pool.
- Cone-type geyser - erupt in a concentrated jet of water from a cone formation
- Hot springs
- Fumaroles - the hottest surface feature, vent steam, no water, just steam
- Mud pots - hydrogen sulfide rises from deep in the earth, microorganisms convert the gas to sulfuric acid which breaks down rock into clay. Gasses escaping through the clay mud cause bubbles to pop.
|Hot spring, west thumb basin|
|don't let this happen to you! see the bones?|
|I wasn't kidding....close up of a fore mentioned bones.|
|run off from hot springs|
|Lone-star geyser is a cone geyser, it is located between west thumb and old faithful, its a 2.5 mile hike in to see it, 5 mile round trip, nice trail along a river.|
|black sands basin|