Betsey D. Dyer, Natalia N. Lyalikova, Daniel Murray, Michael Doyle, Genady M. Kolesov, Wolfgang E. Krumbein; Role for microorganisms in the formation of iridium anomalies. Geology ; 17 (11): 1036–1039. doi: https://doi.org/10.1130/0091-7613(1989)017<1036:RFMITF>2.3.CO;2
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We propose a microbial role in the enhancement, erasure, dispersal, and creation of certain sedimentary iridium anomalies such as those of the Cretaceous/Tertiary boundary. The proposal is based on laboratory experiments that have demonstrated the ability of some bacteria and fungi to concentrate iridium from solution and to dissolve iridium from source igneous and meteoritic rocks.