I love in the runoff zone from Glacial Lake Missoula. Way back in prehistory at the end of the last glacial maximum, the Flathead Valley in Montana was apparently closed off into a great lake and flooded entirely. When the ice dam burst, the entire lake drained across western Montana, the Idaho panhandle, and a lot of Washington State, spreading as it went and scouring the land. It left behind gravel and silt and clay randomly distributed in the valleys and plains here. Any gardening requires manure and compost to build this poor dirt into proper soil.
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Such fascinating geological history. Aty old place half an hour away it's all very old volcanic soil. It had been used for grazing and ag for years so was basically bereft of nutrients. Still, like yout soil, it was perfect as you could just add manure etc. better than clay!