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Online: Geology of the St. Croix Valley


Jim Miller


Date & Time: March 11, 2021 @ 6:30 pm - 8:00 pm

Class Fee: $30.00
Class fee includes cost of material for this class, if provided.

Skill Level: None



Have you ever wondered what makes the St Croix River Valley such a dramatic and beautiful part of Minnesota?  Why does the St Croix river exist and why were we almost the “Riviera of North America” perched on the edge of an ocean?

This webinar will feature a Powerpoint presentation that illustrates and describes the story of how the St. Croix River Valley geologically evolved – a story the spans over one billion years of Earth history and involved three distinctive and dramatic events.  

The story starts with an intense period of volcanic activity related to a failed attempt of North America to break apart about 1.1 billion years ago. 

The next geologic event occurred about 500 million years ago when shallow tropical seas teeming with early marine life inundated the interior of North America and deposited flat-lying sedimentary rocks atop the older volcanic rocks.

The last geologic chapter is related to the repeated advance and retreat of mile-thick continental glaciers over the past two million years.  

Join Jim Miller, retired professor from the University of Minnesota, for a fascinating evening of exploration and discussion. Learn about what is under your feet and all around you, in preparation for your next walk ‘round hill and dale of the St Croix River Valley! 

Materials students will need to have in-hand to fully participate: 

  • Pen and paper to take notes

Online Class General Information:

  • Each registration is for one “device” (one computer, tablet, phone).  This is to ensure we don’t have more people registered than the instructor is comfortable with having in a class.  Please be respectful of this guideline and purchase multiple class spots if more than one person from your household is interested in attending.
  • You will need a reliable Internet connection as well as a computer or device with which to access the online class.  Please arrive 10 minutes before class begins, to ensure your connection and device are ready when the class begins.  
  • Each class will be held using Zoom technology.  You will receive a link and a password and information on how to log on,  prior to the class.  You will be able to view and ask questions during the class.

General Age Policy:
All classes are for adults (18+) unless otherwise noted.

Class Minimums:
Be aware we may cancel 5 days before class date if a minimum number of registrations not reached. We work to balance teachers' need to plan for a class with students' busy schedules -- not an easy task. Please register as early as possible!

Read all of our school policies.


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