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


Upcoming Presentation

Click HERE for the required advance Zoom registration

Tuesday, September 28

6:45PM "Doors Open", 7:00PM Presentation

 Andrew Meigs

College of Earth, Ocean, and Atmospheric Sciences

Oregon State University

 Timing and controls on growth of the Oregon Basin and Range Province

Extension and stretching of the North American plate created the Basin and Range physiographic province in western North America. The northwestern part of this province in northern California and Oregon lies in the backarc of the Cascadia subduction zone, a region characterized by rotational deformation. This presentation will examine the opening and expansion of the Oregon Basin and Range province and the resulting tectonic forces that have shaped central Oregon and the Cascades. Click here for more...

Field Trips

Unfortunately, Field Trips are suspended due to covid-19


Geoscience Events & Activities by Others

Friday September 10th Zoom Lecture

Dr Bill Orr

20 Scientists I've known and Admired

Dr. Bill Orr has assembled an illustrated list of a score of scientists, most of whom he knew personally during his career. These are individuals who thoroughly impressed him by their diligence, and the discoveries they made and published. Several of these individuals motivated him toward micropaleontology as well as marine geology and provided models for him during his fruitful career.

October 10-13th
The Geological Society of America Annual Meeting is in Portland this year! 

Click here for information about the meeting. September 8 is the last day for early registration.

Also consider going on the Deschutes Basin field trip (GSA Field Trip #416, October14-16), co-led by Brad Pitcher (Vanderbilt University), COGS member Anita Grunder (Oregon State University), and Adam Kent (Oregon State University). Marvel at the deep canyons of the Deschutes, Crooked, and Metolius rivers from the comfort of a houseboat on Lake Billy Chinook. See spectacular exposures of ignimbrites and lava flows that record a particularly explosive phase of Cascade volcanism and discuss why these events occurred. Contact Brad Pitcher ( if you have questions about the field trip; contact GSA if you have questions about registration.

K-12 teachers!
Registration for the GSA Annual Meeting in Portland is drastically reduced for K-12 teachers (only $75 for early registration, $85 for standard registration). COGS also offers scholarships that can be used for conference registration fees or travel expenses, see the Educational Outreach page of the COGS website.

Also consider going on the Pacific Coast Geology field trip (GSA Field Trip #403, October 7-9), a three-day adventure filled with hands-on geoscience learning. This field trip is geared specifically toward K-12 teachers and those interested in a broad understanding of Oregon and Northern California geology and its impacts on ecology and environmental systems. Contact Spencer Cody ( if you have questions about the field trip.