We thank the Atlantic Richfield Company (ARCO) in Piano, Texas, and Kent Nielsen at the University of Texas at Dallas (UTD) for the use of their laboratories. We also thank Billy Smith for keeping the equipment running at both the ARCO and UTD labs. Leg 149 physical properties specialists Lotte Krawczyk, Juli Morgan, and Luis Pinheiro and laboratory technicians John Lloyd and Claudia Muller contributed greatly to collection and analysis of the shipboard data and formulation of the post-cruise research objectives. We thank Richard Carlson, Kent Nielsen, and Bob Whitmarsh for helpful reviews. This research was supported by USSSP grant 149-20761b to DLH.