The Frasnian–Famennian biotic crisis (~372 Ma) was one of the “big five” mass extinction events in Phanerozoic. This event associated with dramatic climatic and oceanographic perturbations, including oceanic anoxia, global cooling, sea-level fluctuations. Large-scale volcanic activity is several possible triggers that have been suggested as ultimate cause this crisis, based on Hg enrichment dat...

Pelagic standard conodont biozonation is less applicable to nearshore shallow-water depositional settings close the peritidal, where it needed establish its own zonation. The Upper Devonian Xiejingsi Formation in South China an important unit for biostratigraphy investigation as deposits argillaceous-carbonate mixed facies which yield numerous marine fossils. 25 species belonging 6 genera of pl...

Abstract Upper Devonian carbonates deposited through the Frasnian/Famennian (F/F) stage boundary in Xom Nha Formation, Central Vietnam, were studied. The section is mainly composed of fossiliferous, brecciated, and laminated limestone beds, while shale beds occur a subordinate number. Microfacies generally suggests hemipelagic setting on an outer shelf environment with low sedimentation rates. ...