missoula floods | northendworkbench

Sheeted Clastic Dikes in the Megaflood Region

Here is a reprint of a short article I published in Northwest Geology v. 49 in August 2020. I've made a few fixes that were not included...

The Tops of Clastic Dikes

The tops of most clastic dikes in the megaflood region are truncated by erosion (erosive contacts between flood beds), but not all....

How I Take Field Notes on Clastic Dikes

A page from one of my field books showing what data and information I collect at each outcrop. Twenty-one dikes were exposed at this site...

Evidence for Long Periods Between Fillings in Clastic Dikes

Crosscutting relationships establish the order of events in a sheeted clastic dike exposed near TriCities, WA. 1.) Injection of yellow...

Giant Current Ripples at Omak, WA

Giant current ripples atop a kame terrace surface near Omak, WA. Hwy 20 is at the center of the image. The ripples are of similar scale...

Investigating Effort

Their study consists of 83 locations in the Pasco Basin. In 1999, a group of senior geoscientists at the Hanford Nuclear Site, lead by...

Flood and Slide Deformed Deposits at Priest River, ID

The Ice Age floods inundated the southern portion of the Priest River Valley in northern Idaho, though this is rarely mentioned in the...

Ancient Flood Beds at White Bluffs

An exotic clast-bearing conglomerate at White Bluffs Overlook was left by an ancient Ice Age flood. The post-Ringold unconformity appears...

"Flood Injectites of the Columbia Basin" Book

J Harland Bretz introduced the world to the vast and deeply scoured Channeled Scabland. Baker calculated flood volumes and the velocity...

Flood Count Controls Clastic Dike Width in Columbia Basin, WA-OR-ID

Pleistocene age clastic dikes in the Columbia Basin, WA grew incrementally by repeated injection of sediment into cracks. Injected...

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