National Geologic Map Database
General Information
- Title: Geochemistry, petrography, and volcanology of rhyolites of the Portage Lake volcanics, Keewenaw Peninsula, Michigan
- Author(s): Nicholson, S.W.
- Publishing Organization: U.S. Geological Survey
- Series and Number: Bulletin 1970-B
- Larger Work: Contributions to the geology and mineral resources of the midcontinent rift system
- Publication Date: 1992
- Map Scale: 1:3,450,000
- Cross Section: None
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