Wednesday, September 24, 2008
It's unfortunate that many investigations of Puget Sound's most interesting landslides have been done by consultants working for the people who want to build houses on the landslides! Which sometimes results in really great landslides being interpreted as old logging operations or marine terraces.
The slide plane dips below the beach in this area and emerges mid-beach as a band of uplifted, distorted clays. The toe of the slide is marked by an arcuate ring of large boulders (I'm not sure I understand just why this occurs). In the 1970s and again in the late 1990s this portion of the slide reactivated -- both times making it a little easier to question ambitious schemes to develop the upland portions of the slide.