11/1/2023 0 Comments Crack status doomThese assemblages are dominated by two taxa of inferred mesotrophic affinities (Coccolithus pelagicus, Toweius spp.) and show only low abundances of oligotrophic taxa (Discoaster spp., Fasciculithus spp., Sphenolithus spp.). While this section suffers from intense dissolution at the onset of the event and the peak of the isotopic excursion, it retains well-preserved, diverse nannofossil assemblages from the pre-PETM, PETM recovery and post-PETM intervals. The current study reports the response of calcareous nannofossils across the Paleocene-Eocene boundary in a paleoshelf setting in Jordan (core OS-28), clearly marked by a negative δ¹☼org excursion and the occurrence of characteristic “excursion taxa” (e.g., Discoaster araneus, Rhomboaster spp., Coccolithus bownii). These include a negative carbon isotope excursion, intense carbonate dissolution and biotic changes of marine floras and faunas. The Paleocene-Eocene Thermal Maximum (PETM) is known as an approximately 200 kyr long lasting interval of extreme global warming accompanied by major alterations in the ocean-atmosphere system.
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