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. 2012 Jul 5;3:241. doi: 10.3389/fmicb.2012.00241

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Copyright © 2012 Crosby and Bailey.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in other forums, provided the original authors and source are credited and subject to any copyright notices concerning any third-party graphics etc.

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(A) Phosphorites (arrow) overlain by diatomites from the Miocene Monterey Formation at Shell Beach, California, preserve filaments in (E). (B) Phosphatic microbialite in condensed horizon developed in OC-rich sandy mudstone horizon. Winnowed phosphate nodules are incorporated in the microbialite. (C) Intergrowth of columnar and flat-laminated phosphatic structures developed as a result of microbial mat growth and sediment phosphatization in OC-rich sandy mudstone. Vertical section, polished surface after staining to obtain color contrast between phosphatic and non-phosphatic sediments. (D) SEM of ~600 Ma Doushantuo microfossil showing layering reminiscent of cell membrane. (E) Bundle of large phosphatized filaments resembles filamentous sulfide-oxidizing bacteria. Credits: (A) and (E) from Bailey et al. (2009). (B) and (C) from Krajewski (2011).