Geology and Setting
The Cave and Basin is the lowest component of nine sulphurous hot springs clustered in three groups on the northeast flank of Sulphur Mountain. All are located along the Sulphur Mountain Thrust Fault below Devonian limestones. The water is heated geothermally from an estimated depth of three kilometres. The Cave and Basin is the only underground cavern large enough to comfortably accommodate groups of people.
Read more about this topic: Cave And Basin National Historic Site
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