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BLACK SHALE
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END
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ENVIRONMENTAL-CHANGES
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End Permian mass extinction
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Geography
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Geology
Geosciences
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Multidisciplinary
OCEAN ACIDIFICATION
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OPAL CREEK
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ORGANIC-MATTER
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Osmium isotope
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PERMIAN-TRIASSIC BOUNDARY
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POINT GSSP
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Physical
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Physical Geography
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STRATOTYPE SECTION
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South China
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Volcanism
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Weathering
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