Welcome to the Geological Society of Minnesota
The Geological Society of Minnesota is a nonprofit educational organization in operation since 1938. Our mission has been to promote public interest and to supply educational support in the geological sciences. We sponsor free lectures and labs at the University of Minnesota, conduct statewide and regional field trips, hold classroom presentations for schools, maintain a media library, publish relevant information for public distribution, and maintain and expand upon a series of geological markers throughout the state.
GSM Seminars
GSM seminars with slide show presentations are free and open to the public. They are presented by leading professionals in their fields and are aimed at learners from high school to adult. A question-and-answer session follows each seminar. The labs, also free and open to the public, allow a hands-on learning experience and demonstrate the ideas and principles of geology and earth science. Live lectures and labs require no registration; just show up a few minutes early on the evening of the lecture. These lectures and labs are eligible for Continuing Education Unit (CEU) credits.
Except as noted, live lectures during winter/spring 2025 are Mondays at 7:00 PM CT on the University of Minnesota campus, Keller Hall, Room 3-230. A lecture with (V) following its title is an online virtual lecture. For these, free registration is required by non-members; the instructions are supplied with the lecture description.
The schedule of seminars and labs for winter/spring 2025 is here. For a printable version of our schedule of seminars and labs, click here. Our schedule is planned over 6 months in advance, so changes may occur. Always check this website shortly before each lecture for the latest seminar information.
Winter weather will come and snow might impact our lectures. The GSM will make any decision about cancelling or postponing a lecture due to inclement weather no later than 3:00 PM the day of the lecture. This information will be posted on this page. So check our home page shortly before each lecture in case there is a cancellation or a last-minute change. Also, we will e‐mail lecture postponement and cancellation information to our members.
Recordings of some past GSM lectures are available on the Geological Society of Minnesota YouTube channel. Subscribe to this channel for updates.
In-person only at U of Minnesota, Keller Hall, Room 3-230
Lecture start time 7:00 PM CT.
Summary: Piton de la Fournaise (Reunion Island, Indian Ocean) is one of the most active volcanoes on Earth, erupting once every 9 months on average. This volcano is well known to produce basaltic lavas that can be either extremely crystal-poor, or extremely crystal-rich, with up to 60% vol. olivine and as low as 40% vol. melt. In this talk, we will look into the origin of these olivine crystals, and what they can tell us about the plumbing system of the volcano.
Biography: Ben is a visiting assistant professor at Macalester College. He studies how crystals form in magmas using a variety of microscopes and high temperatures furnaces. Ben earned his PhD in France in 2010, where he studied olivine basalts erupted at Piton de la Fournaise volcano (Reunion hotspot). Since then, he has worked at several research institutes in the US (Hawaii, Cornell, Brown) to expand on his crystal growth research.
Please visit his homepage at https://benoitwelsch.com for an overview of activities.
Minnesota's Geology Markers
Discover Minnesota’s fascinating 3 billion years of geological history by visiting 70-plus geology markers placed around the state by the Geological Society of Minnesota since 1949. Observe and learn about a rift valley, volcanoes, agates, inland seas, glaciers, rivers, caves, sinkholes, iron mining, and more. Click Minnesota’s Geology Markers to see where these markers are located. You can see most markers from your car.
Field Trips
GSM conducts professionally guided geology field trips. These excursions visit locations not usually experienced by the casual traveler. Local field trips can be a few hours long, encompass a weekend, or last longer than a week. Find more information here.
GSM's Student Outreach
Speakers for metro area elementary schools are available through the Public Service Committee to help enrich the education of young learners, particularly the 2nd to 8th grade levels. Find more information here.
Membership
Membership in the society is open to anyone with an interest in geology. The benefits of membership include:
- The opportunity to meet others of who share an enthusiasm for learning and a curiosity for the natural world.
- The rewarding feeling of supporting a nonprofit organization dedicated to public education.
- GSM Newsletter - A quarterly publication contains announcements of upcoming activities, articles on the earth sciences, and GSM projects and activity reports. Past issues
- Extensive Media Library - GSM maintains a collection of more than 330 geological DVDs. These are available to the members at lectures or through the mail for a nominal rental fee. Catalog
- GSM Directory - This annual book is a handy resource and makes it easy to access the organization.