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

    Join 1,071 other followers

  • MOUNT BAKER: Eruptive history, hazards, research.

    Visit Mount Baker Volcano Research Center websites Main website and the blog
  • Most recent posts

  • This website first appeared December 6, 2009

    • 674,471 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

  • Advertisements

Thin en echelon dikes in the Highline Community College erratic; AND a National Geo ‘erratics’ article

The granitic erratic at Highline Community College. Photo by Bud Hardwick.

Bud Hardwick sent photos and geographic information about a large granitic erratic (yes, another one of those dang things) at Shoreline Community College in Des Moines (Washington!). I looked closely at his photos and made some deductions about the geology. Take the virtual field trip to this erratic elsewhere on this website. The rock is notable because of the textbook en echelon dikes running the full length of the big erratic.

Also, the latest National Geographic has a photo essay on glacial erratics by Fritz Hoffman. Alas, none of the ones describe n this website or any others in western Washington are included, not even the Lake Stevens Monster, the largest in the whole country. See  the photos here (an NPR website).

Advertisements