overtexas |
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navigate by keyword : artificial attraction beautiful calcite carlsbad cave cavern caverns column dark geology helictites jack light mexico minerals national natural nature new notch orifice outlet overtexas park passage perforation pit rock rocks rogers scoop shaft shelter southwest space speleology speleothems stalactites stalagmite stalagmites stone subterranean tourism tourists tunnel underground vacuity vent void window |
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Underground cavern limestone and other minerals |
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