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Examination of downhole variation in per cent organic carbon, per cent thickness of black sediment, radiolarian sand (radiolarite layers) frequency, per cent thickness of calcareous mudstone, and graded unit frequency, suggests (1) major organic productivity con¬ trol of blackness and carbon content, (2) local variation in CCD level, and (3) some turbidite deposition for Sites 386 and 387. Cy¬ cles in the mudstones suggest oxygenation/deoxygenation control¬ led by circulation and organic productivity and deposition of the cycles under conditions analogous to those under anoxic bottom waters.

Depositional Features of Organic-Carbon-Rich Black and Green Mudstones at DSDP Sites 386 and 387, Western North Atlantic