![]() ![]() Trace fossils and transported assemblages of inarticulate brachiopods Obolus and Micromitra observed in core samples were used to delineate marginal marine environments. Coarser arkosic sediments appear to be locally derived and related to basement terrains. These data suggest environments dominated by braided fluvial channels with localized alluvial fans adjacent to widespread Precambrian highlands, that merged into a tidally dominated nearshore environment with increasing depth as the Illinois Basin subsided and the Sauk transgressive sequence advanced over the region. This study merges the results of well core analysis and petrophysical subsurface studies within the Illinois Basin and the surrounding area with previous outcrop studies in Wisconsin and Missouri to create a basin-wide interpretation of Late Cambrian depositional environments in the Mount Simon Sandstone. It has been variously interpreted as having been deposited in a tidally dominated nearshore, tidal flat, tidal channel, barrier bar, alluvial fan, and braided fluvial depositional environments. Reference includes data supplied by the Geological Society of America, Boulder, CO, United StatesÄescription The Mount Simon Sandstone is a quartz arenite dominated basal Cambrian unit present throughout the mid-continental United States. GeoRef, Copyright 2022 American Geosciences Institute. Publisher: Geological Society of America (GSA), Boulder, CO, United States. Geological Society of America, 2010 annual meetingĪbstracts with Programs - Geological Society of America, 42(5), p.636 Geological Society of America, 2010 annual meeting, Denver, CO, Oct. Saved in: Bibliographic Details Online Access: ![]()
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