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Abstract

Devil’s Hole is an open fault zone adjacent to a major groundwater discharge area in south-central Nevada; it is located approximately 115km westnorthwest of Las Vegas, Nevada. This open fissure is lined with a thick (Ϡ0.3 m) layer of dense calcite that has precipitated continuously from calcite-supersaturated groundwater. These deposits exist down to depths in excess of 130m below the water table (which is _15m below land surface) and are believed to correspond to a time span of more than the past 500,000 years (Winograd et al., 1992).