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Geology
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Ordovician
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2-METHYLHOPANOID PRODUCTION
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BIODIVERSIFICATION EVENT
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Carbon isotopes
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Early Ordovician
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GLOEOCAPSOMORPHA-PRISCA ZALESSKY
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GOBE
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MICROBIAL COMMUNITY STRUCTURE
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Methane cycling
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Middle Ordovician
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NY-FRIESLAND
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Nitrogen isotopes
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ORGANIC-MATTER
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REDOX CONDITIONS
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SOURCE ROCKS
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Spitsbergen Island (Norway)
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Stratigraphic -- Ordovician
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