HIGH-RESOLUTION STABLE ISOTOPE STRATIGRAPHY FROM BULK SEDIMENT

A high-quality deltaO-18 record has been obtained from a deep sea core in the Somali Basin in a water depth of 4020 m, well below the forami niferal lysocline, by analyzing bulk sediment instead of picked forami nifera. In some areas this may be a valuable tool for extending the ap plicability of the deltaO-18 stratigraphy, for obtaining data by a les s labor-intensive procedure, and for conserving valuable core material . Additionally, we draw attention to the need for more data on deltaC- 13 in bulk carbonate if we are to fully utilize the ocean deltaC-13 re cord either in relation to long-term global carbon budget, or in relat ion to changes in carbon cycling in the ocean and its effect on atmosp heric pCO2.