Hello  !   Thank you for your interest in the Wisconsin Geological Society. Learn about WGS, Geology and upcoming events! Consider becoming a dues paying member to receive the Monthly newsletter 'The Trilobite' and join us for field trips and other adventures.   OUR NEXT WGS MEMBERSHIP MEETING IS ON: Monday, November 10th, 2025 at 7:00 PM   Mary Queen of Saints Catholic Academy (Downstairs, Enter at back of building on 117th St) 1212 S 117th St (Just North of Greenfield Ave):

OUR NEXT WGS MEMBERSHIP MEETING IS ON: Monday, October 13th, 2025 at 7:00 PM Mary Queen of Saints Catholic Academy (Downstairs, Enter at...

WGS is on Summer Break! OUR NEXT WGS MEMBERSHIP MEETING IS ON: Monday, September 8th, 2025 at 7:00 PM Mary Queen of Saints Catholic...

JOIN US FOR OUR NEXT MEETING OUR NEXT WGS MEMBERSHIP MEETING IS ON: Monday, May 12th, 2025 at 7:00 PM   Mary Queen of Saints Catholic...

Join us for the Wisconsin Geological Society Rock & Gem Show coming up SOON!

Fun and good food for all at our annual Christmas Party held on Monday, December 11th (in lieu of our monthly meeting). In addition, we...

Pierre and Kayla from the Wisconsin Geological Society hosted a geological themed birthday party on Saturday, September 23rd featuring a...

WGS Members were invited by Bill Schoenfuss to dig for Moonstone in Marathon County at a private location. It was a farmers field and...

A story of Fire, Water, and Ice. Saturday, August 26th at the Point Beach State Forest Nature Center.

Let's go back in time to approximately 1.8 billion years. Mountains towering over the future Wisconsin landscape and volcanoes spewing...

WGS received a special behind-the-scenes tour of the Field Museum of Chicago's meteorite collection, fluorescent minerals, and we...

Wire Wrapping at Brown Deer Library On Saturday, March 25, 2023, WGS members Denise Hohenfeldt, Mary Shellman and Sue Eyre held a...

WGS will have a table with Wisconsin Rocks and Minerals. Come check us out and check out the Greene Gallery.

May 20th & May 21st 2023 Rocks, Minerals, Crystals, Fossils, Kids Activities & Food Indoors at Muellner Building: Hart Park, Wauwatosa,...

Rib Mountain State Park, the Quarry, Mosinee Hill, and Hardwood Hill are made from quartzite that was once sandstone. The sandstone,...

Saturday & Sunday May 14 and May 15, 2022 (The weekend after Mother’s Day) 10am to 4:30pm each day Admission $3 or 2 for $5 Accompanied...

What is Calcite? Calcite (CaCO3) is a very common and widespread mineral with many forms and colors. The properties that identify calcite...