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and the Neuquén Basin. The negative ?¹³C excursion has been found to be up to -8% in bulk organic and carbonate carbon, although analysis of compound-specific biomarkers suggests a global value of around -3% to -4%. In addition, numerous smaller scale carbon isotope excursions are globally recorded on the falling limb of the larger negative ?¹³C excursion. Although the PTo-E is not associated with a decrease in ?¹³C analogous to the

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