Clastic Dikes in Eastern Washington: Formed by Lateral Spreading?
Lateral spreads. A network of lateral spread fractures in pavement formed by an earthquake. Peru 1970. USGS photo archive. Lateral...
Clastic Dikes: Dispelling a Periglacial Origin
What Does Periglacial Mean? "Periglacial" is a term that packs a punch. Like "tundra" or "permafrost", it stands in for a full suite of...
Clastic Dikes: Whence Upward Intrusion?
Nearly all clastic dikes in the Channeled Scablands are Pleistocene in age, wedge-shaped, and filled from above (Jenkins, 1925; Lupher,...
Clastic Dikes at Metaline Falls, WA
Olaf P. Jenkins took these photos in 1924 near Metaline Falls, WA. They show Pleistocene-age clastic dikes intruding rippled...
Dry Hollow Site Geology near Clyde, WA
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...
Sanpoil-style Syn-sedimentary Deformation
Undeformed flood package. A single, meter-thick Missoula flood bed formed by when a rush of water, released out of western Montana,...
Calcrete Field Trip 2021 - Warden Canal
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...
Calcrete Field Trip 2021 - Liesle Rd
Park vehicles carefully along the roadside or in nearby WDFW lots. Touchet Beds unconformably overlie a calcrete at Liesle Road. At least...
Sill Injectites w/ Shattered Fills - Indian Creek, WA
At Indian Creek, WA I discovered 3 breccia-filled sills injected into varved Glacial Lake Columbia sediments, each extending for more...
Dike-Sill-Dike Geometry in a Fluid-Driven, Sediment-filled Fracture
Coarse Grained Layers Behave as Efficient Pathways - Coarse grained layers appear to behave as efficient pathways during propagation of...
