Fine-grained thinly foliated greenschist and black phyllite occur in a north-northwest-trending belt along the west edge of the area. The rocks are particularly conspicuous near Bacon Peak and in the vicinity of Mount Shuksan.
Milton, Washington (Wikipedia) Milton is a city in King County and Pierce County counties in the U.S. state of Washington. The population was 8,697 at the time of the 2020 census. Milton borders the larger but newer town of Edgewood.