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Minerals 2015, 5(3), 488-506;

Calcification and Diagenesis of Bacterial Colonies

CR2P, Centre de Recherche sur la Paléobiodiversité et les Paléoenvironnements, UMR 7207, CNRS, MNHN, UPMC Univ. Paris 06, Paris 75005, France
IMPMC, Institut de Minéralogie, de Physique des Matériaux et de Cosmochimie, UMR 7590, Sorbonne Universités, CNRS, MNHN, UPMC Univ. Paris 06, IRD, Paris 75005, France
Author to whom correspondence should be addressed.
Academic Editor: Caroline Peacock
Received: 15 May 2015 / Revised: 18 June 2015 / Accepted: 15 July 2015 / Published: 22 July 2015
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Evidencing ancient interspecific associations in the fossil record may be challenging, particularly when bacterial organisms have most likely been degraded during diagenesis. Yet, documenting ancient interspecific associations may provide valuable insights into paleoenvironmental conditions and paleocommunities. Here, we report the multiscale characterization of contemporary and fossilized calcifying bacterial colonies found on contemporary shrimps from Mexico (La Paz Bay) and on 160-Ma old fossilized decapods (shrimps) from the Lagerstätte of La Voulte-sur-Rhône (France), respectively. We document the fine scale morphology, the inorganic composition and the organic signatures of both the contemporary and fossilized structures formed by these bacterial colonies using a combination of electron microscopies and synchrotron-based scanning transmission X-ray microscopy. In addition to discussing the mechanisms of carbonate precipitation by such bacterial colonies, the present study illustrates the degradation of bacterial remains occurring during diagenesis. View Full-Text
Keywords: biomineralization; fossilization; biosignatures; epibiosis; diagenesis biomineralization; fossilization; biosignatures; epibiosis; diagenesis

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Robin, N.; Bernard, S.; Miot, J.; Blanc-Valleron, M.-M.; Charbonnier, S.; Petit, G. Calcification and Diagenesis of Bacterial Colonies. Minerals 2015, 5, 488-506.

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