National Geologic Map Database
General Information
- Title: Phosphatic zone in the lower part of the Maquoketa Shale in northeastern Iowa
- Author(s): Brown, C.E.
- Publishing Organization: U.S. Geological Survey
- Series and Number: Journal of Research of the U.S. Geological Survey V.2-2
- Publication Date: 1974
- Map Scale: 1:263,000
- Cross Section: Yes
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* Names and boundaries are not necessarily authoritative, and are provided here solely for general orientation.