Otis Member
Lithostratigraphy: Hunton Limestone Megagroup >>Wapsipinicon Limestone >>Otis Member
Chronostratigraphy: Paleozoic Erathem >>Devonian System >>Middle Devonian Series
Allostratigraphy: Kaskaskia Sequence
Primary source
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.
Contributing author(s)
Charles Collinson and Elwood Atherton
Name
Original description
The Otis Member of the Wapsipinicon Limestone (Norton, 1894, p. 22-24).
Derivation
Named for the railway junction called Otis, east of Cedar Rapids, Linn County, Iowa.
Other names
History/background
Type section
Type location
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).
Type author(s)
Type status
Reference section
Reference location
Reference author(s)
Reference status
Stratigraphic relationships
The Otis Member of the Wapsipinicon Limestone overlies the Coggan Member (or Silurian dolomite where the Coggan is absent).
Extent and thickness
Lithology
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.
Core(s)
Photograph(s)
Contacts
Well log characteristics
Fossils
Age and correlation
Environments of deposition
Economic importance
Remarks
References
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.
ISGS Codes
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