National Geologic Map Database
Product Description Page
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Title: Phosphatic zone in the lower part of the Maquoketa Shale in northeastern Iowa
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Author(s): Brown, C.E.
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Publishing Organization: U.S. Geological Survey
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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
- North Latitude: 43° 0' 0" N (43.0000)
- South Latitude: 42° 15' 0" N (42.2500)
- East Longitude: 90° 13' 59" W (-90.2330)
- West Longitude: 91° 37' 1" W (-91.6170)
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