Abstract
Wind-deposited calcarenite, or eolian carbonates, are present in the upper member of the Hermosa Formation (Missourian-Virgilian), southeastern Utah. This interval is a 250 m-thick carbonate-dominated unit composed of repetitively interbedded fluvial, eolian, and marine strata. Sharp contacts exist between subwave-base wackestones and overlying eolian carbonates. Skeletal and nonskeletal allochems are found in the eolian deposits. Cyclic marine/nonmarine units of the Hermosa are comparable in age and character to upper Paleozoic cyclothems of the Mid-Continent and were deposited during a period of rapid changes in sea level. Field and petrographic evidence suggests that the eolian carbonates are the product of regression, exposure, and deflation of shallow marine carbonates. The coarse red chert in the eolian units indicates that selective silicification in the marine carbonates occurred early.
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