https://github.com/davepinch/pinchy.cc/blob/master/content/topics/places/king-county-natural-areas/point-heyer-natural-area/point-heyer-natural-area.md
Glacial erratic boulders of King County, Washington (Wikipedia) Glacial erratic boulders of King County are large glacial erratic boulders of rock which were moved into King County, Washington by glacial action during previous ice ages.