Sedimentology of the Pleasantview Sandstone, southern Iowa and western Illinois

The Pleasantview Sandstone has a thick, variably bedded, elongate channel phase and a thin, uniformly thin-bedded, widespread sheet phase. The latter is truncated by the former, hence is older. Various details are discussed. Channels carrying the Pleasantview detritus were eroded, predominantly subaerially, to depths of 70 to 80 feet, as distributaries across a swamp-or marsh-covered deltaic plain. Channel filling was by point bar and/or nonmarine infilling after channel abandonment. Texturally, the sheet phase sands are finer than the channel sands. Excluding matrix, the modal constituents show negligible variation from Iowa to Illinois, and between sheet and channel sands, and little compositional variation from other major Pennsylvanian sandstones of the Eastern Interior Basin.

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