SEEING THROUGH MUD—Photograph (left) and x-ray image (right) of sediments from a region of rapid deposition in the Hudson estuary. The sharp change in color (left) indicates a change from fresh, oxidized sediment to older, anoxic mud. X-rays reveals laminations of silt (light colors) and mud (dark) formed by repeated deposition and erosion over tidal cycles. (Chris
Sommerfield, University of Delaware.)[back]
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