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...

Olaf P. Jenkins took these photos in 1924 near Metaline Falls, WA. They show Pleistocene-age clastic dikes intruding rippled...

Outcrop sketch: For large outcrops, I will take a panoramic photo, draw a quick map, and make a sketch in my field book. If I have the...

Undeformed flood package. A single, meter-thick Missoula flood bed formed by when a rush of water, released out of western Montana,...

Directions - From Othello, drive north on Hwy 17 and turn R (east) on Hwy 170/Rd 8 SE at the '76 gas station toward Warden. Follow for...

Park vehicles carefully along the roadside or in nearby WDFW lots. Touchet Beds unconformably overlie a calcrete at Liesle Road. At least...

At Indian Creek, WA I discovered 3 breccia-filled sills injected into varved Glacial Lake Columbia sediments, each extending for more...

Coarse Grained Layers Behave as Efficient Pathways - Coarse grained layers appear to behave as efficient pathways during propagation of...