Seawater barium and sulfide removal improved marine habitability for the Cambrian Explosion of early animals.

Excess Ba enrichments show an increasing trend with depositional depth, with Ba excess contents of 0.031–0.109 wt% (averaging at 0.067 wt%) at Dazhuliushui, 0.028–0.171 wt% (averaging at 0.073 wt%) at Maluhe, 0.099–1.819 wt% (averaging at 0.725 wt%) at Caojiaping and 0.426–3.347 wt% (averaging at 1.561 wt%) at Sancha.

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