Figure F3. Measured strontium isotopic composition of pore waters and sedimentary carbonate (Site 1050 only) and predicted sediment strontium isotopic composition plotted as a function of depth for each drill site. Predicted sediment strontium isotopic compositions were estimated from biostratigraphic markers and the strontium look-up table of Howarth and McArthur (1997). The symbol diameter for the measured values of Site 1050 sediment is slightly smaller than two standard deviations (±2 ) about the mean. For comparison, a composite seawater strontium isotopic curve derived from the 0- to 206-Ma curve published by Howarth and McArthur (1997) is also illustrated. Significant sedimentary hiatuses determined using shipboard biostratigraphy (Norris, Kroon, Klaus, et al., 1998) are indicated for each hole to provide a time context.