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Petrology and Stratigraphy of the Epitaph Dolomite (Permian) in the Tombstone Hills, Cochise County, Arizona
The Permian Epitaph Dolomite is 762.5 feet thick in the type section on the west side of Epitaph Gulch and consists of, in ascending order, 318 feet of dolomite, 124 feet of calcitic siltstone, 189.5 feet of dolomite, and 131 feet of limestone. The allochemical material includes coated grains, intraclasts, pellets, and fossil hash in which very little internal structure is preserved because of dolomitization or because of recrystallization from micrite to microspar. Evidence derived from a correlation with other sections measured in southeastern Arizona and New Mexico, and from field comparisons appears to indicate the Epitaph is a dolomitized facies of the Colina Limestone, formed by seepage refluxion in a shallow water environment, with local restrictions in which gypsum formed. Str tigraphic position and fossils indicate an early to middle Leonardian age for the Epitaph.
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