Abstract
El Ediacárico terminal inlcuye una serie de cambios drásticos en los ciclos biogeoquímicos, muchos de los cuales se asocian con modificaciones evolutivas en los registros fósiles correspondientes. Entre ellos destacan las condiciones redox, las cuales pueden haber causado un impacto profundo en la evolución animal temprana. Este trabajo destaca el significado de la lito-, bio- y quimioestratigrafía en la investigación geobiológica del tiempo profundo.
Highlights
The terminal Ediacaran witnessed the first appearance of macroscopic organisms including the earliest biomineralizing animals in Earth history (Narbonne et al, 2012; Xiao et al, 2016)
In the Gaojiashan Member of the Dengying Formation, integrated bio- and chemo-stratigraphic profiles 2019) show that the first appearance of the biomineralizing animal fossil Cloudina is closely associated with positive anomalies of δ13Ccarb, δ34Spyrite, and Sr/Ca values (Fig. 1)
These results suggest that environmental and physiological pressures from an increase in seawater alkalinity - likely coupled with ecological pressures from predation (Hua et al, 2003, 2007) - set the stage for the evolutionary novelty of animal biomineralization
Summary
The terminal Ediacaran witnessed the first appearance of macroscopic organisms including the earliest biomineralizing animals in Earth history (Narbonne et al, 2012; Xiao et al, 2016). Two rare soft-bodied Ediacara assemblages are preserved in well-exposed marine carbonate successions of the Dengying Formation in South China (Chen et al, 2014) and the Khatyspyt Formation in Arctic Siberia (Grazhdankin et al, 2008), where comprehensive chemostratigraphic studies have recently been completed.
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