CONCLUSIONS

•Stable oxygen isotope records from Site 1014 exhibit the familiar sawtooth pattern of late Quaternary climate change.

•A detailed chronology for the last 175 k.y. has been developed based on 20 stable isotope datums (SPECMAP) for Site 1014.

•There are no major hiatuses in the late Quaternary at Site 1014, and sedimentation rates in the basin were almost constant, with average rates of 11.5 cm k.y.^-1

•The planktonic foraminiferal ¹⁸O record shows that the magnitude of the glacial-interglacial temperature change was ~7°C, similar to results from other lower resolution cores from Tanner Basin, and agrees with other southern California margin cores.

•During the last interglacial, the planktonic ¹⁸O record was affected by several episodes of dissolution that coincided with cooler marine isotope Substages 5b and 5d.

•Last interglacial planktonic ¹⁸O values were higher than Holocene values by more than 0.8, apparently not because of cooler temperatures but as a result of the effects of preferential dissolution of thin-shelled specimens.

•The glacial-interglacial change in benthic ¹⁸O was unusually large for a water depth of 1165 m, suggesting that both temperature and salinity changed dramatically over this interval in response to switches in the source of the intermediate water mass bathing the site.

•Planktonic ¹³C values are similar to other southern California sequences and display similar negative excursions during Termination I and late MIS 3. This suggests that these events were regional.

•The benthic ¹³C record correlated well with the global ¹³C record during the last 85 k.y., suggesting that ventilation and productivity effects at this location and depth were minor over this interval.

•Between 135 and 85 ka, the benthic ¹³C record was controlled by ventilation of the intermediate water and was linked to changes in upwelling, organic material deposition, and corrosivity of the bottom water.

•The benthic ¹⁸O Holocene record differs from the Eemian by exhibiting a slow decrease in ¹⁸O during Termination I, leading to lighter values than the previous interglacial.