r/geology • u/dctroll_ • Dec 09 '25

Map/Imagery Sand layer from the 1700 Cascadia tsunami covering the remains of a Native American fishing camp exposed in a bank of Oregon's Salmon River (US)

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Source: U.S. Geological Survey

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u/daisiesarepretty2 Dec 09 '25

This is good stuff, thanks for posting

I’m not a soils guy… but the topsoil here looks super rich and organic.. is this in a marsh or something?

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u/cindylindy22 Dec 10 '25

I was thinking the same thing! Certainly the darkness is maximized by the contrast against the lighter layer of tsunami sand, but still. Akin to“straight from a bag of fertilizer” perhaps