- Geologic Map of the East Half of the Bellevue South 7.5’ x 15’ Quadrangle, Issaquah Area, King County, Washington
The Issaquah area includes several of the most outstanding geologic features of the eastern Puget Lowland region. Folds have warped thousands of meters of Tertiary sedimentary and volcanic rocks. Several hundred meters of both glacial and postglacial sediment have accumulated in a deep glacial trough, which is now partly occupied by Lake Sammamish but which was previously the conduit for massive volumes of meltwater during ice-sheet occupation and retreat. The eastern projection of an east-west-oriented crustal structure, which reflects Tertiary through Holocene fault displacement, extends across the eastern part of the map area.
- Shelton View Forest (wta.org)
Not far from the northern tip of Lake Washington, this pocket forest provides local residents and those in the Puget Sound area with a crucial link to the outdoors. The Shelton View Forest is more than 60 acres in size, plus two half-mile approach trails through additional acreage and varied habitat.
- Puget Group (Wikipedia)
The Puget Group is a geologic group in Washington (state). It preserves fossils dating back to the Paleogene period. ¶ Two key formations include the Renton Formation and the Tukwila Formation.