The definitive article on clastic dikes in Eastern Washington. Origin, age, character, and distribution are discussed. Data driven research.

Nearly all clastic dikes in the Channeled Scablands are Pleistocene in age, wedge-shaped, and filled from above (Jenkins, 1925; Lupher,...

Near field (blue) and far field (red) hydrofracture curves shown. During the hydrofracture period, fluid pressure drops as fractures...

Colville River Mouth. The Colville River enters the Columbia River at Rivermile 100 just south of Kettle Falls, WA. Its an easy hike...

Locations of paleoseismic trenches and Quaternary faults in Eastern Washington. Trenches excavated across fault scarps, visible in lidar...

Exotic clasts in gravel . An exotic clast-bearing conglomerate at White Bluffs Overlook was left by an ancient Ice Age flood. The...

Trenching at Wallula, WA In 2020, the U.S. Geological Survey excavated a trench across a suspected fault scarp near Wallula, WA in an...

Clastic Dikes in Miocene Basalt Sheeted dikes with sandy fills intrude downward into Miocene Columbia River Basalt in the Walla Walla...

Lateral spreads. A network of lateral spread fractures in pavement formed by an earthquake. Peru 1970. USGS photo archive. Summary...

What Does Periglacial Mean? "Periglacial" is a term that packs a punch. Like "tundra" or "permafrost", it stands in for a full suite of...