Boulder Park Boulder Park National Natural Landmark, along with the nearby Natural Landmarks McNeil Canyon Haystack Rocks and Sims Corner Eskers and Kames comprise several of the best examples of Pleistocen...
Cascadia subduction zone The Cascadia subduction zone (also referred to as the Cascadia fault) is a subduction zone, a type of convergent plate boundary that stretches from northern Vancouver Island to northern California.
Centralia Coal Mine Centralia Coal Mine is an open-pit coal mine, owned by the Canadian based TransAlta Corporation.
Challis Arc The Challis Arc was an Eocene volcanic arc that stretched from southwestern British Columbia through Washington to Idaho, United States.
Channeled Scablands The Channeled Scablands are a barren, relatively soil-free landscape in eastern Washington, scoured clean by a flood unleashed when a large glacial lake drained.
Chilliwack batholith The Chilliwack batholith is a large batholith that forms much of the North Cascades in southwestern British Columbia, Canada and the U.S. state of Washington.
Chuckanut Formation The Chuckanut Formation in northwestern Washington (named after the Chuckanut Mountains, near Bellingham), its extension in southwestern British Columbia (the Huntingdon Formation), and various ...
Cobb hotspot The Cobb hotspot is a volcanic hotspot located off the Oregon/Washington coast of the United States.
Cordilleran Ice Sheet The Cordilleran ice sheet was a major ice sheet that periodically covered large parts of North America during glacial periods over the last ~2.6 million years.
Drumheller Channels National Natural Landmark Drumheller Channels National Natural Landmark showcases the Drumheller Channels, which are the most significant example in the Columbia Plateau of basalt butte-and-basin channeled scablands.
Dry Falls Dry Falls is a 3.5 mile long scalloped precipice in central Washington, on the opposite side of the Upper Grand Coulee from the Columbia River, and at the head of the Lower Grand Coulee.
Foster Coulee Foster Coulee is a coulee in Douglas County, Washington.
Geology of the Pacific Northwest The geology of the Pacific Northwest refers to the study of the composition (including rock, minerals, and soils), structure, physical properties and the processes that shape the Pacific Northwe...
Glacial Lake Columbia Glacial Lake Columbia was the lake formed on the ice-dammed Columbia River behind the Okanogan lobe of the Cordilleran Ice Sheet when the lobe covered of the Waterville Plateau west of Grand Co...
Grand Coulee The Grand Coulee is an ancient river bed in the U.S. state of Washington.
Hoko River Formation The Hoko River Formation is a Late Eocene marine sedimentary geologic formation.
Intermontane Belt The Intermontane Belt is a physiogeological region in the Pacific Northwest of North America, stretching from northern Washington into British Columbia, Yukon, and Alaska.
Joseph Canyon Joseph Canyon (Nez Perce: an-an-a-soc-um, meaning "long, rough canyon") is a -deep basalt canyon in northern Wallowa County, Oregon, and southern Asotin County, Washington, United States.
Lake Lewis Lake Lewis was a temporary lake in the Pacific Northwest region of North America, largely formed by the Missoula Floods in about the 14th millennium B.C.
Missoula Floods The Missoula Floods (also known as the Spokane Floods or the Bretz Floods) refer to the cataclysmic floods that swept periodically across eastern Washington and down the Columbia Riv...
Moses Coulee Moses Coulee cuts into the Waterville plateau in Douglas County, Washington.
Olympic-Wallowa Lineament The Olympic-Wallowa lineament (OWL) – first reported by cartographer Erwin Raisz in 1945 on a relief map of the continental United States – is a physiographic feature of unknown ori...
Pacific Northwest Seismic Network The Pacific Northwest Seismic Network, or PNSN, collects and studies ground motions from about 400 seismometers in the states of Oregon and Washington to monitor volcanic and tectonic acti...
Palouse Falls The Palouse Falls lies on the Palouse River, about upstream of the confluence with the Snake River in southeast Washington, United States.
Portland Basin (geology) The Portland Basin is a roughly topographic and structural depression in the central Puget-Willamette Lowland.
Puget Sound faults The Puget Sound faults under the heavily populated Puget Sound region (Puget Lowland) of Washington state form a regional complex of interrelated seismogenic (earthquake-causing) geologic faults.
Seattle Fault The Seattle Fault is a zone of multiple shallow east-west thrust faults that cross the Puget Sound Lowland and through Seattle (in the U.S. state of Washington) in the vicinity of Interstate Hig...
Sims Corner Eskers and Kames The Sims Corner Eskers and Kames National Natural Landmark includes excellent examples of Pleistocene ice stagnation landforms including numerous glacial erratics, terminal moraines, eskers, and...
Stonerose Interpretive Center and Fossil Site Established in 1989, the Stonerose Interpretive Center and Fossil Site is an Eocene Epoch fossil site and accompanying interpretive center, located in Republic, Washington, part of the Okanagan ...
Straight Creek Fault The Straight Creek Fault (SCF) is the principal north-south strike-slip fault in the state of Washington, with a minimum of 90 kilometers (54 miles) of right-lateral offset, and a major geologic...
Tacoma Fault The Tacoma Fault, just north of the city of Tacoma, Washington, is an active east–west striking north dipping reverse fault with approximately 35 miles (56 km) of identified surface r...
Touchet Formation The Touchet Formation or Touchet beds consist of large quantities of gravel and fine sediment which overlay almost a thousand meters (several thousand feet) of volcanic basalt of the Colum...
Umtanum Ridge Water Gap Umtanum Ridge Water Gap is a geologic feature in central Washington state in the United States.
Wallula Gap Wallula Gap is a large water gap of the Columbia River through basalt anticlines in the Columbia River Basin in the U.S. state of Washington, just south of the confluence of the Walla Walla and ...
Wedgwood Rock Wedgwood Rock is a glacial erratic (and known to geologists as the "Wedgwood Erratic") near the neighborhood of Wedgwood in Seattle, Washington.
Wenatchee Dome The Wenatchee Dome is a large, igneous intrusion located on the southern end of Miller Street in Wenatchee, Washington.