Abstract
The Late Devonian (372–359 million AD) is a time of prolonged climate instability with catastrophic disturbances to global marine ecosystems at the Frasnian–Famennian (F/F) and Devonian–Carboniferous (D/C) boundaries. Global atmospheric CO2 content and climate change in the middle Paleozoic, especially in the Late Devonian, coincide with major events of extinction of organism groups. Anoxic intervals were documented within the Kellwasser event near the Frasnian/Famennian boundary (F/F), the Annulata event in Famennian and the Hangenberg event near the Famennian/Tournaisian boundary (D/C).
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