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Figure F25. Plot of methane concentrations, Hole U1406A. Lithostratigraphic Unit I is Pleistocene foraminiferal sand and nannofossil ooze, Unit II is Oligocene–Miocene nannofossil ooze, Unit III is middle Eocene–early Oligocene nannofossil chalk, and Unit IV is Paleocene–middle Eocene nannofossil chalk with foraminifers.

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