Oceanic anoxia is considered as the immediate cause of Frasnian–Famennian mass extinction, yet frequency and associated environmental modulators remains unknown. Here, we demonstrate that astronomical forcing paced oceanic anoxic episodes by mediating land-ocean interactions during Upper Kellwasser (UKW) Event, using an ultra-high-resolution (one centimeter spacing), multi-proxy geochemical pro...

Abstract A relatively complete conodont record from Famennian to the Mississippian/Pennsylvanian boundary was investigated in Anarak section, Central Iran. The studied interval belongs Bahram, Shishtu, Ghaleh and Absheni formations. part of section (Bahram Formation) ranges Palmatolepis triangularis Zone into Bispathodus ultimus Zone. Not all zones could be defined due lack indicative species. ...