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.

First Page Preview

First page PDF preview
You do not currently have access to this article.