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Agnes Owen appears arch basin beautiful Black Hills caves Blondy's Throne boxwork calcite calcite crystals called canon carbonate Cave Regions cavern ceiling chamber charming clay color County crawl crevice Crystal Cave deposits descended distance drip dripstone entered entrance eruption explored Fairy Cave feet high feet wide fifty feet fissures floor formation geodes Geological geologist geyser activity Greer Spring height hole hundred feet inches known ladder lake length light lime loess Luella Agnes Magnesian Limestone Mammoth Spring Marble Cave Marvel masses miles Missouri mountain narrow nearly Onyx Cave opening Owen Owen's Ozark County pass passage pop-corn portion Powell reached rising River road rock rope seen side slope South Dakota specimens speleogenesis Speleologie speleothems stairway stalactites stalagmites Stone County stream surface theory tion trip tube twenty feet vapor visitors walls width Wind Cave wonderful Yellowstone