For the interval from 49.67 to 108.58 revised meters composite depth (rmcd), the splice was sampled at ~10-cm intervals (see "Revised Composite Depth
Scale", for an explanation of depth scales). This depth section corresponds to approximately 3-1.2 Ma. Handpicked benthic foraminiferal tests in the >150-µm sized fraction were analyzed for stable carbon and oxygen isotopic composition (Table T1; Fig. F1). All analyses were completed at Woods Hole Oceanographic Institution on a Finnegan MAT252 automated mass spectrometer with a Kiel device (Ostermann and Curry, 2000). Individual tests were analyzed where possible. Most species analyzed were Cibicides wuellerstorfi, although other Cibicides sp. and Uvigerina sp. were used where C. wuellerstorfi was unavailable. Standard corrections were employed for isotopic offsets among species, as summarized by Shackleton and Hall (1984). Interspecies corrections for oxygen isotope values followed Shackleton (1974), adding 0.64 to 
18O values from Cibicides sp. An offset of -0.9 was added to 13C values measured from Uvigerina sp. (Duplessy et al., 1984); 0.35 was added to the 18O value for the single Nuttalides umbonifera analyzed (Shackleton and Hall, 1984). The average species offsets between C. wuellerstorfi and Uvigerina sp. that were calculated for duplicates within the Site 1123 data set are in statistical agreement with these offsets. The values listed in Table T1 are corrected for species offsets.
