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/...

An integrated palynological and geochemical approach has been initiated to date precise the events of Pimenteiras Formation, in Late Devonian from Parnaíba Basin, Brazil. Based on good biostratigraphic markers presence index species among miospores, acritarchs chitinozoa, investigated sequences are referred Middle early Frasnian. Among Miospores, Chelinospora concinna Verrucosisporites bullifer...

The Late Devonian (Frasnian-Famennian) interval includes one of the most dramatic intervals of biotic turnover in the Phanerozoic. Statistical evaluation of diversity change reveals that the primary cause of biodiversity decline was reduced speciation during the crisis interval, not elevated extinction rates. Although various hypotheses have been proposed to explain extinction increase during t...

This is the first report of organic-walled tentaculid remains from Givetian through Frasnian age deposits Michigan and Appalachian Basins in western Laurussia. adds to geographic scope similar finds that have been described Famennian eastern However, those previous specimens were retrieved palynological preparations more closely resemble sheath structures rather than full forms found herein, wh...

The zonal scheme of the Givetian-Frasnian boundary interval in Timan-Northern Urals region was detailed according to higher plants spores. Palynological zones were correlated with faunal, including conodont — orthostratigraphic group Devonian. correlation identified critical boundaries development plant communities divisions’ borders International Stratigraphic Scale series and stages, establis...