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,...

Rulo is a classic Palouse outcrop . The Rulo site is a large, double-sided roadcut located a few miles northwest of Walla Walla along...

The Reese Coulee site is a two-sided roadcut along Hwy 12 between Wallula Junction and Touchet, WA. The cut is important because Missoula...

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 fault trenches in Eastern Washington. Trenched faults in the Yakima Fold Belt . Locations of fault trenching investigations by USGS, Washington Geological Survey, DOGAMI, USBOR, and others. Most trenches were excavated in Columbia River Basalt. The Spencer Canyon trench, epicenter of the 1872 North Cascades quake, lies outside the YFB in older crystalline rocks of the Cascade Range. The Gales Creek trench, near Portland, is not shown on the map. Trench studies ha

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...

The tops of clastic dikes in the megaflood region appear five ways. 1.) Truncated by a bedding contact or an erosional surface 2.)...