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Willman, H. B., Elwood Atherton, T. C. Buschbach, Charles Collinson, John C. Frye, M. E. Hopkins, Jerry A. Lineback, and Jack A. Simon, 1975, Handbook of Illinois Stratigraphy: Illinois State Geological Survey Bulletin 95, 261 p.
Charles Collinson and Elwood Atherton
The Otis Member of the Wapsipinicon Limestone (Norton, 1894, p. 22-24).
Named for the railway junction called Otis, east of Cedar Rapids, Linn County, Iowa.
The Otis Member is 26 feet thick where exposed in its type section in a quarry at Cleveland, Henry County (S1/2 31, 18N-2E).
The Otis Member of the Wapsipinicon Limestone overlies the Coggan Member (or Silurian dolomite where the Coggan is absent).
The Otis Member is fine-grained to lithographic, light gray to brown limestone with a few lenses of chert. In the region where it thins out on the flanks of the Sangamon Arch, lenses of quartz sandstone as much as 5 feet thick occur at the base.
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NORTON, W. H., 1894, Notes on the lower strata of the Devonian Series in eastern Iowa: Iowa Academy of Science Proceedings 1, part 4, p. 22-24.
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