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- W1966976516 abstract "Phosphatic rocks are a distinctive part of the Lower and lower Upper Mississippian Delle Phosphatic Member of the Woodman Formation at the type locality of the member in the Lakeside Mountains, northwestern Utah. There, as elsewhere in central and western Utah, the Delle is composed of a relatively thin, anomalous depositional interval characterized by phosphorite, siliceous microfossils, secondary chert, distinctive dense lime mudstone, and argillaceous rocks stratigraphically sandwiched within a thick sequence of subtidal and peritidal Mississippian shelf carbonate and craton-derived siliciclastic rocks. Strongly reducing in-sediment conditions evidently prevailed at the onset of Delle deposition, yet sedimentologic features in the Delle such as endolithic-algal borings in pisolitic phosphorite and features in the rocks above and below the Delle such as tidally laminated fecal-pellet limestones and exclusively tractional sedimentary structures indicate shallow, shelf depositional environments. These rocks do not support the concept of a deep, sediment-starved depositional basin, the Deseret deep starved basin of previous authors. Rather, the nature of the Delle suggest incursion far onto the broad Early Mississippian shelf of nutrient-rich, organically productive waters possibly produced by upwelling in the coeval Antler foreland trough in central Nevada. This interpretation places the Early Mississippian shelf margin to the west ofmore » the Lakeside Mountains-probably west of Utah-rather than in central Utah, as required by the Deseret deep starved basin model.« less" @default.
- W1966976516 created "2016-06-24" @default.
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- W1966976516 date "1990-01-01" @default.
- W1966976516 modified "2023-09-25" @default.
- W1966976516 title "Delle Phosphatic Member: An anomalous phosphatic interval in the Mississippian (Osagean-Meramecian) shelf sequence of central Utah" @default.
- W1966976516 doi "https://doi.org/10.1130/0091-7613(1990)018<0046:dpmaap>2.3.co;2" @default.
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