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Breedy. Minneapolis, Minnesota: University of Minnesota Press. ISBN 978-0-8166-0953-6. Kean, William F. (24 November 2000). "Keweenawan Rift System". Field...16 KB (1,634 words) - 22:55, 17 April 2024- Minnesota's Geology. Minneapolis: University of Minnesota Press. ISBN 978-0-8166-0953-6. "Deep Valleys Make SE Minn. Vulnerable". wcco.com. August 20, 2007...42 KB (3,614 words) - 10:28, 13 September 2023
Breedy. Minneapolis, Minnesota: University of Minnesota Press. ISBN 978-0-8166-0953-6. "Geologic Time: Age of the Earth". United States Geological Survey...165 KB (14,582 words) - 07:09, 27 April 2024
(1982). Minnesota's Geology. University of Minnesota Press. ISBN 978-0-8166-0953-6. Chandler, Val W. (August 3, 2005). A Geophysical Investigation of...47 KB (5,564 words) - 15:24, 24 November 2023
April 22, 2015. Ojakangas, Richard W (1982). Minnesota's Geology. ISBN 9780816609536. "River Bluff Outcrops". University of Minnesota. Retrieved May 26,...48 KB (5,921 words) - 19:35, 30 March 2024
