Joachimski and Buggisch (2002) claim climatic cooling as a trigger of the Late Devonian Frasnian-Famennian (F-F) transitional mass extinction based on conodont apatite δ18O signatures from two Germanic sections, where the measured conodont apatite δ18O values showed two positive excursions with maximum amplitudes of +1.0‰ to +1.5‰ Peedee belemnite (PDB). According to them, this translates to cooling of low-latitude surface waters by 5–7 °C. Joachimski and Buggisch (2002) suggest that conodont apatite was formed in isotope equilibrium with ambient seawater and had a high potential to preserve its primary δ18O signature, that the Frasnian...

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