Lake Waccamaw has a broad, flat bottom of gyttja ( mud ) and peat encircled by sandy shallows and submerged sandy terraces that extend up to 500 m offshore.
2.
In 2008, Peter Astrup, of the University of Aarhus, during a survey of a previously known submerged Stone Age site along the coast of Hjarn? noticed that erosion had exposed many layers of the gyttja.
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