1. G. Bond, M. Cheseby, R. Lotti, P. Almasi, P. deMenocal, P. Priore, and H. Cullen are at the Lamont-Doherty Earth Observatory of Columbia University, Route 9W, Palisades, NY 10964, USA. W. Showers is in the Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, 1125 Jordan Hall, Raleigh, NC 27695, USA. I. Hajdas and G. Bonani are in the AMS 14C Lab, ITP Eidgenössische Technische Hochschule (ETH) Honeggerberg, CH-8093 Zurich, Switzerland.