Minnesota at a Glance Geologic Time

• Main Authors: Southwick, D.L., Lusardi, B.A., Dengler, E.L.
• Format: Report
• Language: English
• Published: Minnesota Geological Survey 2017
• Subjects: geology; geologic time; Minnesota Geological Survey; age; Canada; Greenland; Morton; Siberia
• Online Access: http://purl.umn.edu/59441

Short summary of geologic time and age dating of rocks in Minnesota, issued in 1997, revised 2017. Minnesota is host to some of the oldest rocks on Earth; parts of the Morton gneiss in western Minnesota have been dated at 3.5 billion years old. Rocks as old as or older than these are rare on earth b...