COGS is a Central Oregon-based non-profit organization promoting a greater awareness and understanding of the geological sciences through technical presentations, educational outreach to schools, and field trips

Upcoming Presentation

Tuesday, May 25 

Andrea Balbas, Oregon State University 

I Date Rocks: A Geochronology Love Story

Rocks are amazing in that they offer us a window into the past and tell stories that can be beyond human imagination. This allows us to understand Earth processes that we have not directly witnessed. A key to unraveling the possible cause and nature of such processes is an understanding of their timing and pacing. This is the power of geochronology. From the order of a stratigraphic sequence to the radiometric ages of lava flows, geologists have continued to invent and develop new ways for determining when something occurred in Earth’s past. For me, getting new ages from rocks is like taking a trip back in time and that is why I love it.

Recent Presentations

click HERE for the recorded Presentation 

Tuesday April 27th

Kyle Gorman, Region Manager, Oregon Water Resources Department

Water in the Deschutes Basin: 2020 Hindsight – What Happened?

Click HERE for MORE Past Presentations

Geoscience Events & Activities by Others

Thursday April 29th Zoom Presentation

Don Hann - US Forest Service

Oregon Chinese Diaspora Project: Gold Mining in the Upper John Day Valley

Click HERE for Zoom Link

Tuesday May 11th Zoom Presentation

Paul Ballinger, Sound Waters Steward

Paleoceanographic history that led to our understanding of Cenozoic climate history and changing impact for the Pacific Northwest.

Contact Amy Knudson at for Zoom details.

Friday May 14th Zoom Lecture

Jon Major

Scientist-in-Charge - USGS Cascades Volcano Observatory

Volcano Hazards in the Pacific Northwest

Friday, April 30 @ 10 a.m. to 5 p.m.

12th Annual Bretz Club Conference (Free) 


 A potpourri of the geomorphic consequences of disturbances