Geo basics

This page links to articles I have written elsewhere on the website that illustrate some ‘basic concepts’ in geology. Bear with me as I develop these pages.

Articles on the Northwest Geology Field Trips website (click on blue links):

THE FORMATION OF PILLOW LAVA with links to where to see them in Washington.



If you are unfamiliar with technical geologic terms, recommended references to have on your shelf, whether you are a ‘professional’ or ‘citizen’ geologist are:

A Dictionary of Earth Sciences (1999) Second Edition, edited by Ailsa Allaby and Michael Allaby. New York, Oxford University Press. 599 pages, plus appendices and references.

The old stand-by dictionary has been:

Dictionary of Geologic Terms (1983) 3rd Edition, edited by Robert L. Bates and Julia A. Jackson. New York, Doubleday. 571 pages.   This book badly needs a new edition, as it does not contain many recent terms added to the geologic lexicon.

Websites with definitions of geologic terms:

This one seems to have the most words:

13 Responses

  1. Awesome! Thank you again very much for all you do & all the sharing of knowledge, experience, discoveries! Much appreciated.

  2. WOW! Love the new aspect to your site. This is going to be a mandatory site visit for my classes. While sixth graders new to geology will struggle with some of the information others will be challenged. Thank you for all the local (and beyond) information you share! You rock! Roger

  3. Any suggestions for a guy who knows nothing, but is intrigued and would like to be able to drive down the road in his RV and say something better than, ‘cool rocks’?

    • James,
      Thanks for subscribing and for your question. Try the books in the “Guides, Books and Maps” section of this website [tab at the top]. Also, if you like field trips [no geo background needed] sign up for updates from the Mount Baker Volcano Research Center blog. Occasional fund raiser geo field trips to the Mount Baker area. The link is in the right hand column on this webpage.
      Dave Tucker

  4. Dear Dave,
    Just discovered your wonderful website – a friend found it for me. I have submitted a request to the Sno-Isle Library System to acquire your book when it is published. I can’t wait to read it. I’m personally interested in finding where the South Whidbey Fault(s) intersect the bluffs. If you have a field trip with that purpose in mind I’d be interested.

  5. Looks like the blog is no longer active but wanted you to know tha t i bought your book and am enjoying —- helpful to understanding the world around us
    Kathleen myers MD
    Prof Emerita, UW

  6. Newish to Washington. Just started exploring when COVID hit. There are some very large conglomerates of smaller, fused rocks in the farmland in north central WA. We were told they were formed by glaciers. What are they called?

  7. So appreciate your blog! We just visited Whidbey and read your post on the geology at Double bluff.

    • Thanks K. Did you find everything I wrote about? I describe Double Bluff in greater detail in a chapter in my book, Geology Underfoot in Western Washington. DT

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