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The late Cretaceous Mancos Shale in western Colorado contains several vadose caves developed entirely within the shale. The largest of these, Rock Pigeon Cave, is over 300 m in length and contains a seasonal stream. The cave, and others like it, is hypothesized to develop as a result of the oxidation of disseminated pyrite in the shale by descending meteoric water, with resulting sulfate ions reacting with the carbonate component of the shale to produce gypsum. The gypsum pries apart the shale,

Author

cricu

Language

EN