https://github.com/davepinch/pinchy.cc/blob/master/content/topics/people/k/katie-britt/2024-republican-address/62.md
Easterbrook (1973) shows Birch Point to be composed primarily of Bellingham glaciomarine drift with a veneer of sand and gravel. This material, when wet, has low strength and is prone to slumping or flow, particularly along the sea cliffs.