Environmental disturbance, resource availability, and biologic turnover at the dawn of animal life

New high‐resolution age data from the Ediacaran–Cambrian boundary indicate rapid, ecologically driven onset of the Cambrian explosion

“…The second model, which conforms to Benton's metaphoric ‘double wedge’ (Benton, ; Sepkoski, ), predicts an extended period of replacement, during which the CTF expanded at the expense of the ETB (Figure b). The diversity decline from the older White Sea assemblages to the younger Nama assemblages has been depicted in this light (Darroch et al., ; Muscente et al., ), as have the sporadic reports of rangeomorphs from the Cambrian (Hagadorn et al., ; Jensen, Gehling, & Droser, ). However, survivorship of rangeomorphs into the Cambrian is questionable (Laflamme et al., ) and represents at best an exception.…”

“…The new timeframe allows testing of different evolutionary models for the replacement of the Ediacaran‐type biota (ETB) by the Cambrian‐type fauna (CTF) (Darroch et al., ; Laflamme et al., ; ; Muscente et al., ; Smith et al., ). We herein discuss three models, which differ significantly in the time‐scale they predict.…”

“…The replacement of the enigmatic Ediacaran biota by morphologically disparate animals (metazoans) at the beginning of the Phanerozoic was a key event in the history of life, which has been explained by environmental, evolutionary or ecological factors, possibly superimposed by a major taphonomic bias (e.g., Darroch et al., ; Laflamme, Darroch, Tweedt, Peterson, & Erwin, ; Muscente, Boag, Bykova, & Schiffbauer, ; Schiffbauer et al., ). These hypotheses predict different time‐scales for this turnover; however, age data with sufficient time resolution have been lacking to date.…”

Late Vendian kotlinian crisis on the East European Platform: lithogeochemical indicators of depositional environment

“…Поскольку захороненное в осадках ОВ подвергается постседиментационным преобразованиям, реконструкции палеобиопродуктивности, основанные исключительно на литогеохимических индикаторах, имеют свои ограничения [Averyt, Paytan, 2004;Anderson, Winckler, 2005]. В случае венда сложно использовать также и принцип актуализма, так как производство и экспорт первичной продукции в то время, когда фито-и зоопланктон еще не сформировались, могли сильно отличаться от современных процессов [Lenton et al, 2014;Lenton, Daines, 2017;Shields, 2016;Butterfi eld, 2018;Muscente et al, 2018].…”

“…ры [Вендская…, 1985;Brasier, 1989Brasier, , 1992aBrasier, , 1992bBrasier, , 1995Brasier, Lindsay, 2001;Muscente et al, 2018].…”