Abstract
The sediments in the Thingvellir lake basin have been successfully dated by tephra layers back to ca. AD 900, the time of Nordic Settlement in Iceland. Nine of the twelve tephra layers known to have been deposited within or near the Thingvallavatn area since that time have been identified in sediment cores, providing an excellent source of information on the rate of sedimentation in the lake basin. The rate of net sedimentation increases proportionally with water depth below a critical limit of 30 m water depth, indicating a hydrologically controlled sedimentation
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