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Limestone and marble underground formations  in Oregon Caves National Monument.  Eons of acidified groundwater have slowly etched away at marble, creating the extensive and intricate cave formations in Oregon Caves National Monument Limestone and marble underground formations  in Oregon Caves National Monument.  Eons of acidified groundwater have slowly etched away at marble, creating the extensive and intricate cave formations in Oregon Caves National Monument Limestone and marble underground formations, Miller's Chapel grotto in Oregon Caves National Monument.  Eons of acidified groundwater have slowly etched away at marble, creating the extensive and intricate cave formations in Oregon Caves National Monument Limestone and marble underground formations, Miller's Chapel grotto in Oregon Caves National Monument.  Eons of acidified groundwater have slowly etched away at marble, creating the extensive and intricate cave formations in Oregon Caves National Monument Paradise Lost formation in Oregon Caves National Monument.  Eons of acidified groundwater have slowly etched away at marble, creating the extensive and intricate cave formations in Oregon Caves National Monument Visitors admire the Pipe Organ formation of calcite flowstone and cave curtains, Crystal Cave, Sequoia Kings Canyon National Park, California Visitors admire the Pipe Organ formation of calcite flowstone and cave curtains, Crystal Cave, Sequoia Kings Canyon National Park, California The Pipe Organ, a formation of calcite flowstone and cave curtains, Crystal Cave, Sequoia Kings Canyon National Park, California The Pipe Organ, a formation of calcite flowstone and cave curtains, Crystal Cave, Sequoia Kings Canyon National Park, California The Pipe Organ, a formation of calcite flowstone and cave curtains, Crystal Cave, Sequoia Kings Canyon National Park, California Calcite flowstone and cave curtains, Crystal Cave, Sequoia Kings Canyon National Park, California Calcite flowstone and cave curtains, Crystal Cave, Sequoia Kings Canyon National Park, California Visitors admire the many stalactites hanging from the ceiling of the Dome Room, Crystal Cave, Sequoia Kings Canyon National Park, California Many stalactites hang from the ceiling -- and a huge stalagmite has grown up from the floor -- of the Dome Room. The formation was named for its resemblence to the Capital Dome in Washington D.C, Crystal Cave, Sequoia Kings Canyon National Park, California Many stalactites hang from the ceiling -- and a huge stalagmite has grown up from the floor -- of the Dome Room. The formation was named for its resemblence to the Capital Dome in Washington D.C, Crystal Cave, Sequoia Kings Canyon National Park, California Many stalactites hang from the ceiling of the Marbled Room, Crystal Cave, Sequoia Kings Canyon National Park, California Many stalactites hang from the ceiling of the Marbled Room, Crystal Cave, Sequoia Kings Canyon National Park, California Calcite stalactites hanging from above have joined with stalagmites growing on the cave floor to form a solid column, Crystal Cave, Sequoia Kings Canyon National Park, California Calcite stalactites and stalagmites, Crystal Cave, Sequoia Kings Canyon National Park, California Calcite stalactites and stalagmites, Crystal Cave, Sequoia Kings Canyon National Park, California Calcite stalactites and stalagmites, Crystal Cave, Sequoia Kings Canyon National Park, California

Updated: April 20, 2021