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    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 book: Geology of the San Juan Islands

San Juan Islands geologist Ned Brown brings us a wonderful new geology guide- just in time for holiday gifts.

Ned Brown's Geology of the San Juan Islands. Chuckanut Editions, 2014

Ned Brown’s Geology of the San Juan Islands. Chuckanut Editions, 2014

Geology of the San Juan Islands is a full color guide to the geology of these beautiful islands. The book is written for the geophile of all stripes. It is the best, easiest-to-understand explanation of San Juan geology I have seen, and I urge you to spend $19 and get your own copy right now.

Ned Brown is an emeritus professor in the Western Washington University Geology Department. He has been working in the islands for decades. The complex geology of the archipelago has long inspired and exasperated geologists. Ned’s book describes the remarkable tectonic history that has repeatedly brought together unrelated rocks from around the Pacific and stacked them against each other during subduction. His color photos and detailed diagrams explain the processes and evolution of each of the rock units clearly. The book also explains how he and others have come up with this most current interpretation of San Juan Islands geologic history, by mapping rock units and faults, dating zircon crystals in the rocks, identifying fossils and correlating these with the ancient areas where these creatures lived.  Ned tells you just where to go to see the best outcrops, including all the photo locations. Among the more amazing ideas he throws out is the possible origin of the oldest rocks in the  350- to 500-million year old Turtleback Complex on Orcas Island. The gabbro and granitic rocks, once intruded deep in the crust,  may have originally intruded deep in the crust….in northern Europe! This was during the time of the supercontinent Rodinia.

The book is self-published through the Chuckanut Editions imprint of Village Books in Bellingham. The book is not yet available. Go buy a copy in the store, or write Village Books and ask them to please make the book available for on-line orders.Dave Tucker

 

A bit of the mantle: Washington Park, Fidalgo Island, Washington

The 'snake-skin' texture of serpentinite lends its name to 'ophiolite'. This is a nice example near the foot of the stairs.

The ‘snake-skin’ texture of serpentinite lends its name to ‘ophiolite’. This is a nice example near the foot of the stairs.

A geology guide to ultramafic rock at Washington Park, near Anacortes, is now available on Northwest Geology Field Trips. Click here to go straight to the field trip! The rock is the metamorphic rock serpentinite, and was originally in the earth’s mantle below oceanic crust. Exposures are found along the dramatic rocky shore and on bare rocky knobs above the coastal cliffs. A single essential outcrop is highlighted in this quick self-guided field trip. The description explains what ‘ophiolite’ is and points out spectacular glacial polish at the same outcrop.

Coming soon:

  • Mount Erie- Fidalgo ophiolite Part 2
  • Finlayson Point, Victoria
  • Rock Trail, Larrabee State Park
  • ?????

Do you have field trips to share? Please do. Let’s branch out to places in southern and eastern Washington. I’m happy to help you write your guide . Contact me via comment or email:

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