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- W2253562108 abstract "Abstract Cretaceous sedimentary strata of the western United States provide a critical window into the depositional history and tectonic evolution of the region. Here we describe the Upper Cretaceous Bacon Ridge Sandstone of northwestern Wyoming, a largely unstudied marginal marine system deposited in a relatively high accommodation – high sediment supply area along the western margin of the Cretaceous Western Interior Seaway. The Bacon Ridge Sandstone is ~300 m thick and consists of numerous 10–30 m thick storm-wave dominated shoreface sandstone units interstratified with lesser amounts of lagoonal mudstone, fluvial sandstone, tidal channel sandstone, and nonmarine carbonaceous shale and coal. Vertical stacking of facies associations can be divided into multiple packages that consist of relatively thick (20–30 m) shoreface sandstone units overlain by coal and nonmarine deposits that are in turn overlain by lagoonal mudstone and tidal channel deposits. Reflecting the high accommodation setting, subaerial unconformities are rare-to-absent within the succession, and are therefore ineffective for sequence stratigraphic analysis. In lieu of unconformity surfaces, we use maximum flooding surfaces (Maxfs), which are often amalgamated with transgressive surfaces of erosion (TSE), to subdivide the Bacon Ridge Sandstone into 4–6 sequences. The basal Maxfs/TSE is overlain by regressive deposits, characterized by ~20 m thick successions of multiple, amalgamated shoreface parasequences that are overlain by 5–10 m of nonmarine lower coastal plain deposits. Importantly, the thick shoreface sandstone units contain numerous internal heterogeneities, including grain size changes and zones of differing cementation, which could act as baffles to fluid flow. The upper ~10 m of the depositional sequences consist of transgressive deposits and are dominated by lagoonal mudstone that were deposited as relative sea-level rose and barrier-island systems retrograded landward. The Bacon Ridge Sandstone is the marginal marine portion of a large-scale progradational sequence and records the last marine regression from this portion of the Western Interior Foreland Basin. We propose that the high sediment influx into the area was associated with a large, long-lived fluvial megafan that emanated from the uplands to the west and delivered large volumes of synorogenic sediment to this portion of the basin." @default.
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- W2253562108 date "2009-01-01" @default.
- W2253562108 modified "2023-09-26" @default.
- W2253562108 title "The Bacon Ridge Sandstone of Northwestern Wyoming and Its Place Within the Larger-Scale Late Cretaceous Depositional History of the Region" @default.
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