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Submitted on: 13 June 1999.
Revised on: 15 July 1999.
Accepted on: 21 July 1999.
Paleoceanography and Paleoclimatology
Submitted on: 25 July 2006.
Revised on: 21 August 2006.
Accepted on: 02 September 2006.
Paleoceanography and Paleoclimatology