Technical Comments

Comment on "Early Archaean Microorganisms Preferred Elemental Sulfur, Not Sulfate"

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Science  07 Mar 2008:
Vol. 319, Issue 5868, pp. 1336
DOI: 10.1126/science.1151241

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Philippot et al. (Reports, 14 September 2007, p. 1534) interpreted multiple–sulfur isotopic compositions of ∼3.5-billion-year-old marine sulfide deposits as evidence that early Archaean microorganisms were not sulfate reducers but instead metabolized elemental sulfur. However, their data can be better explained by a scenario involving poor mixing of photochemical and surface sulfide sources.

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