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Report of Investigations  [70]

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RI-68 Quaternary Lithostratigraphic Units of Minnesota

Johnson, Mark D.; Adams, Roberta S.; Gowan, Angela S.; Harris, Kenneth L.; Hobbs, Howard C.; Jennings, Carrie E.; Knaeble, Alan R.; Lusardi, Barbara A.; Meyer, Gary N. (Minnesota Geological Survey, 2016-03)
Much of Minnesota is covered by sediment of Quaternary age that was deposited during numerous glaciations by ice, wind, and water. In this report, we follow guidelines of the North American Stratigraphic Code (North American ...

RI-70, Characterization of the Franklin Peridotite and Other Similar Intrusions in East-Central and Southwestern Minnesota

Boerboom, Terrence J. (2014)
Outcrops of peridotite adjacent to the Minnesota River near the town of Franklin in Renville County were sampled and petrographically characterized as part of a small study funded by the Minnesota Department of Natural ...

RI-69 Reexamination of the Minnesota River Valley Subprovince with Emphasis on Neoarchean and Paleoproterozoic Events

Southwick, David (2014-03-06)
The Minnesota River valley subprovince (MRV) is a fragment of Mesoarchean continental crust that was sutured to the southern margin of the Superior craton about 2,600 m.y. ago. The suturing event induced widespread ...

RI-67 Lunisolar Tidal Signatures in the ~1.9 GA Pokegama Formation, Northeastern Minnesota: Implications for the Lunar Orbit

Ojakangas, Gregory W.; Ojakangas, Richard W. (2010)
Specimens of siltstone beds from a roadcut in the lower member of the ~1.9 Ga Pokegama Formation at the village of Midway near Virginia, Minnesota contain laminae that record possible neap-spring cycles and a strong ...

RI-52 Mineral Development in Minnesota: Past History, Present Trends, and Future Possibilities

Morey, G.B. (Minnesota Geological Survey, 1998)
Mineral development, like all development in Minnesota in the 21st century, will occur within the principles of sustainable development. However those principles are not entirely applicable to the extractive-minerals ...

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