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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