Widespread marine anoxia triggered by the runoff and recycling of nutrients was a key phenomenon associated with Frasnian–Famennian (FF) mass extinction. However, relative importance global-scale processes versus local influences on site-specific environmental change remains poorly understood. Here, nitrogen-isotope (δ15N) trends are combined organic-biomarker, phosphorus, Rock-Eval data in FF ...

The Late Devonian Frasnian–Famennian (F–F) mass extinction has been long-time debated by non-volcanic causes, extra-terrestrial impacts, and large igneous province (LIP) eruptions. To better understand the ultimate cause of F–F extinction, here we investigate chemostratigraphy mercury (Hg) total organic carbon (TOC) on two marine strata in Dushan area, South China. In both sections, high Hg Hg/...

A new species of Dunkleosteus, D. tuderensis sp. nov., is named based on an infragnathal from the Famennian Tver Region, Russia. CT scanning holotype revealed two high-density bony constituents comparable in position and interrelations to components described for coccosteomorph arthrodires, supported by presence at least clusters large vascular canals marking separate arterial supplies. Coccost...