We thank the Leg 163 crew on the JOIDES Resolution for their skilled efforts during the storm on September 30, 1995. Lew Hogan and Chris Sinton are thanked for analytical assistance, and Peter Riisager is thanked for discussions about cryptochrons. The National Science Foundation (U.S.), the Danish National Research Foundation, and the Danish Research Council supported this study. Thoughtful reviews by J. Gee, H.C. Larsen, and an anonymous referee greatly improved the manuscript.