Stratigraphy of the Osage Series in Southeastern Iowa: Report of Investigations 1, 1964

(1964) Stratigraphy of the Osage Series in Southeastern Iowa: Report of Investigations 1, 1964. University of Iowa

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Abstract

The Osage Series in southeastern Iowa is composed primarily of cherty carbonate rocks. Thin shale beds appear in the middle of the series and increase upward in number and thickness. The lithologic character and thickness of the series are relatively uniform throughout the area. This gives no suggestion of major changes in environment of deposition or tectonics either laterally or vertically. It is convenient to consider the area in two parts, the south eastern district and the western district. Subsurface sections in the southeastern district are readily matched to the classic surface exposures of the Burlington Limestone, Keokuk Limestone, and Warsaw Formation near the Mississippi River. The lithlogies of the three formations are so similar that small changes, and especially dolomitization toward the west, make tracing of boundaries difficult.