• Your EMAIL ADDRESS is never used for ANY purpose except to send you updates. EVER!!!!!!

    Join 1,181 other followers

  • MOUNT BAKER: Eruptive history, hazards, research.

    Visit Mount Baker Volcano Research Center websites Main website and the blog These are no longer actively maintained but are still good references [DT, April, 2020]
  • Most recent posts

  • This website first appeared December 6, 2009

    • 770,859 hits
  • Feel free to use the material on these pages.

    Creative Commons License
    This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 United States License.
    Northwest Geology Field Trips, by Dave Tucker, is licensed under a Creative Commons Attribution-Noncommercial- Share Alike 3.0 United States License. You can use what you find here, repost it with attribution to the author, "remix" it for your own purposes, but may not use it with the intent of making money off of it.

    EDUCATORS: Please feel free to use anything you find here that is useful to your mission educating people about Earth science. E-mail me if it would help to have a larger or higher-resolution version of any of the images. tuckerd at geol dot wwu dot edu

Cougar Divide field trip updated


Pale dikes intrude Nooksack Fm. at the head of Dobbs Creek.

I hiked Cougar Divide again on September 12, and have updated the field trip guide. You can read it here. This is the easist and best place in the area to see intrusive dikes.

The updated guide includes these changes: better directions to find the oldest dated rock in the Mount Baker volcanic field, a rhyodacite dike, and the GPS coordinates have been changed slightly; a new photo added showing the dikes at the head of Dobbs Creek.

The ridge is beautiful. I noticed that there was some hoar frost on the trail in a few places, and there are patches of fresh snow on the snow slopes below Chowder Ridge. Take an ice ax to reach Chowder, as there is a short section of firm, steep, and exposed snow to cross just below the ridge.

Virtual geology field trip: Cougar Divide

Acres of flowers and meadows on the crest of Cougar Divide. Did I say I like this hike? The snow fingers mark the Dobbs Creek headwaters, site of many dikes. Copyright Dave Tucker.

I have broken out of my writing doldrums and written a self-guided geology field trip to Cougar Divide on the north flank of Mount Baker. Figure I better provide people with a summertime hike before it is too late! This hike is mostly volcanic geology that long predates Mount Baker. In fact, the oldest dated rock in the Mount Baker volcanic field is found on the ridge crest. That alone makes this beautiful hike significant.

Read the field trip here.