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The soils in the unglaciated part of Wisconsin have a loess cover over sedimentary rock, mostly dolostone of Ordovician age. The dolostone has weathered and produced layers of red clay or Terra Rossa. We have sampled 144 pedons of 16 catenas with different slope aspects and curvatures in a 70km 2 area. Half of all the pedons had a red clay subsoil (mostly 5YR 3/4) and had on average over 40%...
A red clay subsoil is commonly found in the soils of the Driftless Area of Wisconsin, USA. The red clay is buried by a layer of loess and occurs on uplands underlain by dolostone. It is assumed to have derived from the impurities of the weathered dolostone. The red clay has implications for groundwater recharge and lateral flow of water through the landscape as well as the fixation of excess phosphorus...
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