Relationships between bacterial-algal proliferating and mass extinction in the Late Devonian Frasnian-Famennian transition: Enlightening from carbon isotopes and molecular fossils

The five major mass extinctions which occurred in the transition of the Ordovician-Silurian (440 Ma), Late Devonian Frasnian-Famennian (F-F) (370 Ma), Permian-Triassic (250 Ma), Triassic-Jurassic (205 Ma) and Cretaceous-Paleogene (65 Ma) are significant phenomena in the Phanerozoic global environment and organic evolution. Their corresponding extinction rates of marine invertebrate at the level of genus and family are 60% (genus) and 26% (family), 57% and 22%, 82% and 51%, 53% and 22%, …     

Negative carbon isotopic excursion on the Lower/Middle Cambrian boundary of Kaili Formation,Taijiang County,Guizhou Province,China: Implications for mass extinction and stratigraphic division and correlation

The stratigraphic division and correlation of the Lower/Middle Cambrian boundary is a global problem that has not yet been solved even up to now. That is because there existed two distinctly different biogeographic regions during the Early and Middle Cambrian[1]—— the Indian-Pacific biogeographic region and the Atlantic biogeographic region. In the Atlantic biogeographic region the traditional Lower/Middle Cambrian boundary was marked by the extinction of Olenellids trilobite and the in…