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Petrographic observations confirm the continental origin of the organic matter and the presence of reworked, altered organic material in the sediments from DSDP Sites 370 and 416. The reflectance of the primary vitrinite-huminite population establishes that these samples are in the mature stage of evolution. The very low organic-carbon content of these samples makes ESR interpretation particularly difficult.

Preliminary Results of Petrographic and Electron-Spin-Resonance Studies of Organic Matter from Deep Sea Drilling Project Sites 370 and 416