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

    Join 1,189 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    Visit Mount Baker Volcano Research Center websites Main website and the blog These are no longer actively maintained but are still good references [DT, April, 2020]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

    • 774,022 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

New Geology hiking guide published on this website: Ridley Creek Trail, Mount Baker

Link to Ridley Creek Trail geology guide:

https://nwgeology.wordpress.com/the-fieldtrips/ridley-creek-trail-geology-guide/

Foot bridge over the Middle Fork

Foot bridge over the Middle Fork

Ridley Creek Trail begins at the end of the Middle Fork Nooksack Road on the southwest flank of Mount Baker. The trail accesses the heather meadows of Mazama Park and on to Park Butte Lookout. Along the way see forested latest Pleistocene moraines, glacial till from Canada complete with quartzite pebbles from the Rocky Mountains, limestone, lahar and ash deposits, a close up of the Cathedral Crag lava that predates Mount Baker, and finally, great views of Baker, the Black Buttes, and that enigmatic slice of the mantle, the Twin Sisters Range. Read the geology guide here.  Enjoy!

Dave Tucker

Geology field trips offered by North Cascades Institute

I will be leading three field courses on behalf of North Cascades Institute in late summer of 2013.Also, my friend David Williams will lead an urban geology tour in Seattle.

Migmatite in the Diablo Overlook road cut? What's 'maigmatite'? Sign up to find out!

Migmatite in the Diablo Overlook road cut. What’s ‘migmatite’? Sign up to find out!

August 9-11: GEOLOGY OF THE NORTH CASCADES: CROSS SECTION THROUGH THE CRUST. This course will be based out of the NCI Environmental Learning Center at Diablo Lake. Over three days we will examine different sites along Highway 20 from Sedro Woolley to Washington Pass. Meals and lodging at the Learning Center.

Kuslhan caldera, Mount Baker, and Table Mountain volcanics can all be examined along the Ptarmigan Trail.

Kulshan caldera, Mount Baker, and Table Mountain volcanics can all be examined along the Ptarmigan Trail.

September 28 and repeated on September 29: MOUNT BAKER: THE STORY OF VOLCANOES I AND II. I will lead a one day hike along Ptarmigan Ridge on the east flank of Mount Baker.We will look at volcanic deposits from the Kulshan caldera, pre-Mount Baker andesite volcanoes, and young Baker itself. These two hikes will fill up VERY QUICKLY so register right now if you are interested.

In downtown Seattle, see 3.5 billion year old Morton gneiss, probably the oldest building stone in the world!

In downtown Seattle, see 3.5 billion year old Morton gneiss, probably the oldest building stone in the world!

Also on September 28, David Williams leads ‘Street Smart Naturalist’. This will be a walking tour of downtown geology. highly regarded and a must for Seattle residents interested in geology.

Registration and descriptions for all these programs begins at the NCI geology webpage.

Pillows in the Middle Fork Nooksack

Stacked pillows. Stolen from a commercial website. So, sue me.

Stacked pillows. Stolen from a commercial website. So, sue me.

(Click HERE to go straight to the page about the pillows along the road.)

No, pillow lava, silly!

Cross-sectioned basalt lava pillow in the Elbow Lake Formation, Middle Fork Nooksack Road. Click to enlarge.

Cross-sectioned basalt lava pillow in the Elbow Lake Formation, Middle Fork Nooksack Road. Click to enlarge.

I planned a XC ski trip up the Porter Creek Road or elsewhere off the Middle Fork Road today, but it was raining and 41 degrees. Indulging my secret identity as a geologist, I instead poked around in a roadside quarry, looking at pillow lava in the Elbow Lake Formation. A rewarding outing from Bellingham if you have a 2-3 hours on your hands and a deeply felt need to look at some exotic, unusual, and (admittedly) not too beautiful rocks. The saving grace is the lava pillows, and a cup of coffee on the way and on the way back. As an added bonus, there is access to Twin Sisters dunite nearby.

P.S. There ARE some nice roads to ski up and back down off the Middle Fork.

Baker River geology field guide posted

Baker River's braided channel just above Lake Creek.

Baker River’s braided channel just above Lake Creek.

After a hike up the Baker River Trail at the north end of the Baker Reservoir, I just had to write it up for the blog. Shuksan Greenschist, waterfalls, an entrenched delta-cum-alluvial fan, exhumed eroded giant tree stumps, and really cool river cobbles, including volcanic breccia from Hannegan caldera. An easy round trip of 5 miles, even good in the pouring rain. Read the field trip here.

Online geology field trip: the Deadhorse Volcano, Skyline Divide, Mount Baker volcanic field

The last couple of miles of Skyline Divide. The Deadhorse Volcano is marked by the red pin and Hildreth’s unit designation ‘acr’. Click to enlarge.

A nearly unknown volcanic vent is exposed in cross section on a rock wall at the south end of Skyline Divide north of Mount Baker. Click here to read my on-line field guide to the informally named  “Deadhorse Volcano“. Yes, I know, winter approacheth, so chances to visit this eroded volcano are fast-slipping away. Hope for a weather break, or save this little gem until after the snow is gone next year. The snow that hasn’t fallen- yet.

Wells Creek volcanics in the North Fork Nooksack field trip is published

Wells Creek volcanics form rock cliffs along Mount Baker Highway a few hundred feet above the Nooksack River gorge.

If you have driven up the Baker highway beyond Nooksack Falls you have passed through these rocks, part of a Jurassic chain of  oceanic volcanoes. The rocks also occur at the famous falls. The rocks are now accreted to the North America, and lie at the base of the stack of terranes that make up the Northwest Cascades System of the Cascade Mountains. Click here to take the field trip.