Black Chasm Cavern was designated a National Natural Landmark by the National Park Service in 1976 after being recommended by local members of the National Speleological Society, and as such is considered a "nationally significant natural area.” http://bkphotos.smugmug.com/Nature/Caves/Black-Chasm-Caverns-California/SH107298/267951234_wx3S3-Ti.jpg http://bkphotos.smugmug.com/gallery/4547688_xsWS7/ 2008-03-19T11:58:07Z Copyright 2009, the copyright holder of each photograph. Some portions copyright SmugMug. All rights reserved. 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