Take a good, close look at sand, ash, and other sediments.
exposed near Hammer Creek, Idaho
Incredible ripples (gravel dunes), deposited subaqueously in the channel of the Columbia River Gorge near Quincy, Washington.
Erosional and depositional features along the Pinto Ridge Road, showing effects of the Glacial Lake Missoula megafloods.
Big gravel bars in a Scabland channel, just downstream from Wilson Creek.
Glacial Lake Missoula outburst floods deposited the gravel of the Ephrata Fan near Soap Lake. These foreset beds show advancing gravel deposits.
West of Quincy, there are big gravel dunes deposited subaqueously by the Glacial Lake Missoula outburst floods.
Cross-section through a giant gravel bar deposit in Channeled Scablands. First described by J Harlan Bretz.
Bill Richards for scale.
Diatoms on the SEM.
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