06.07.2013 Views

Nebraska Soils Field Trip - Virginia Tech

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4th IUSS Soil Classification Conference <strong>Field</strong> Tour Guidebook<br />

A close-up view of the irregular topography of the boundary between the ^Bw2 and ^Cug horizons at a<br />

depth of 52 cm. The ^Cug horizon is a gray (10YR 6/1) artifactual silt loam which contains about 20<br />

percent, by volume, artifacts of metal, rubber, plastic, untreated wood, and cloth. Reduced or ferrous<br />

iron (Fe 2+ ) is present in the absence of saturation by ground water. Methane produced by the<br />

decomposition of organic refuse may be enhancing the reducing conditions by providing a ready carbon<br />

source for microbes and by excluding oxygen from the horizon.<br />

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