- In geology, a terrane (/təˈreɪn, ˈtɛreɪn/; in full, a tectonostratigraphic terrane) is a crust fragment formed on a tectonic plate (or broken off from it) and accreted or “sutured” to crust lying on another plate. The crustal block or fragment preserves its distinctive geologic history, which is different from the surrounding areas—hence the term “exotic” terrane. The suture zone between a terrane and the crust it attaches to is usually identifiable as a fault. A sedimentary deposit that buries the contact of the terrane with adjacent rock is called an overlap formation. An igneous intrusion that has intruded and obscured the contact of a terrane with adjacent rock is called a stitching pluton.
- Snoqualmie Bog Natural Area Preserve (dnr.wa.gov)
This preserve protects a sphagnum moss bog and freshwater wetland system, now extremely rare in the Puget Sound basin. The site includes two state-listed sensitive plant species, mountain bladderwort and few- flowered sedge, as well as the state-candidate Beller’s ground beetle. A small strip of natural old growth forest with western hemlock and western redcedar remains along one edge of the bog.