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    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.

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Thick Mazama ash in a landslide dammed lake, Skagit Valley

Bob Mooers at the outcrop beside the highway.

A new field trip visits a 10-m-thick deposit of Mount Mazama Layer O ash (from the Crater Lake caldera collapse) along Highway 20 near Newhalem. How did all that ash accumulate? Read the tale…



One Response

  1. First of all I would like to express my great appreciation to you for your website and field trips. My 15 year old son and I are hobby geologists and have spent much time at many of your field trip sites and places we find on our own. Your website has been a great source of information and I always look forward to the new posts. All the location descriptions have been good but most the locations I am already familiar with having been pursuing interesting geology features in Whatcom county for 35 years. Thank you again

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