National Geologic Map Database
General Information
- Title: Stratigraphy of Middle Ordovician rocks in the zinc-lead district of Wisconsin, Illinois, and Iowa [Mississippi Valley]
- Author(s): Agnew, A.F., Behre, C.H., Jr., Heyl, A.V., Jr., and Lyons, E.J.
- Publishing Organization: U.S. Geological Survey
- Series and Number: Professional Paper 274-K [p. K251-K312]
- Larger Work: Shorter contributions to general geology, 1955-57
- Publication Date: 1956
- Map Scale: 1:1,355,290
- Cross Section: None
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