Portland’s myriad architectural styles are a showcase for dramatic and beautiful geological stories. From lava floods and volcanos to tropical seas and billions-of-years-old mountain building events, the geology of building stone has shaped 150 years of Portland’s architecture.

Paul Edison-Lahm, Communications Director for the Geological Society of the Oregon Country, will present this virtual tour.

Please Register. Limited seating available.

• $20.00 — AHC Members
• $30.00 — General Public

Sep 26, 2026 10:00 AM - 11:30 AM PT