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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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‘Mounds’ between Sedro Woolley and Burlington

Hello Dave,
I’ve always wondered about the large “mounds”/irregularities to the East of I-5 between the Skagit and Samish rivers… They’re pretty hard to miss. How did they form, and what exactly are they?

Carston, May 29, 2013

Burlington Hill looking south from Cook Road. Click to enlarge any image.

Burlington Hill looking south from Cook Road. Click to enlarge any image.

In response to Carston,  my geologist friend Doug McKeever and I finally got around to making the jaunt south to look at these conspicuous wooded hills that rise out of the Skagit River flood plain. The greenschist and phyllite is quite interesting and very easy to get to. The driving trip is a worthwhile short detour of just a few miles when you are passing by on I-5. On a nice day the view from one of the hills over the flats is wonderful. The field trip is posted here.

Silvery phyllite and greenschist.

Silvery phyllite and greenschist on Burltingon Hill.