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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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Stillaguamish Landslide- Geologic Perspectives

Interpretation of landslide scarp on LiDAR image, by Dan McShane.

Interpretation of landslide scarp on LiDAR image, by Dan McShane. Click to enlarge.

Dan McShane has written some geologic perspectives about Saturday’s landslide into the Stillaguamish River. Dan is a consulting geologist based in Bellingham and author of ‘Washington Landscapes’ blog, and has some great insights into the geology and history of the slide area. Rather than trying to rewrite his excellent reports, I’ll just provide the links. It is not the first landslide in this location. In my view, it  is a tragedy that people are permitted to live in this location.


Dan’s Initial report:


Geologic background:


LiDAR images and slide history.


Stay tuned for more posts from Dan. Consider subscribing to his blog.


Nooksack River landslide near Deming: An update

My friend Dan McShane visited the Nooksack shore immediately across from the Clay Banks landslide toe Saturday and posted a great set of photos on his Washington Landscapes blog, as well as further analysis of the changes to the river channel at the Clay Banks in the past years. Click this to read his report. Dan visited a different area than I did, and his report is well worth reading. His newest photos of the landslide deposit are toward the bottom of the post. Among his observations are blocks of clay across the river from the failing hillside of the Clay Banks. One of his photos is below, showing the landslide toe where the river has cut through it.