Comparison of two gravity coring devices for sedimentation rate measurement by 210Pb dating techniques

Marine sediment cores were collected in Puget Sound using a 7.6 cm diameter corer and a 15 × 15 cm square cross-section corer. The cores were dated by the 210Pb method and sedimentation rates and depth of sediment mixed layers were compared. The results show that both the sedimentation rates and the depth of sediment mixed layers obtained from small diameter corer are 2–3 times smaller than the corresponding values obtained from large cross-section corer. A cross-calibration of coring techniques seems necessary to correlate the sedimentation rates obtained using different devices.