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.
Plymouth Pillars Park (Wikipedia) Plymouth Pillars Park is a public park in Seattle, in the U.S. state of Washington. The .6-acre (0.24 ha) park is located at the intersection of Boren Avenue and Pike Street, on the southwestern edge of Capitol Hill.