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Unraveling the three-dimensional morphology of Archean microbialites

Published online by Cambridge University Press:  14 July 2015

Marisol Juarez Rivera  and
Dawn Y. Sumner
Marisol Juarez Rivera
Affiliation:
Department of Earth and Planetary Sciences, 1 Shields Avenue, University of California, Davis, CA 95616 USA, and
Dawn Y. Sumner
Affiliation:
Department of Earth and Planetary Sciences, 1 Shields Avenue, University of California, Davis, CA 95616 USA, and
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Abstract

Fenestrate microbialites from the 2521±3 Ma Gamohaan Formation, South Africa, are composed of calcite with traces of kerogen that represent the remains of ancient microbial mats. To delineate the 3-D geometry of these microbialites, specimens were serial-sectioned; sequential slices were polished in 120 μm increments and scanned to yield an image stack, which was rendered into a virtual model of the microbialites. The resulting virtual representation allowed for visualization and characterization of microbial growth geometries that were not visible from 2-D surfaces. Several new insights into the structure of microbialites emerged from characterizing their 3-D structure including the recognition of two new features, linear structures and tubular structures. The long, thin nature of these structures makes them difficult to identify in two dimensions. However, in three dimensions, they can be traced as thin ropes of fossilized microbial communities emerging from more typical microbial mat structures. Overall, these results demonstrate a new set of microbial features in the Gamohaan Formation that were only characterized by reconstructing the full geometry of the microbialites in three dimensions.

Type
Research Article
Information
Journal of Paleontology , Volume 88 , Issue 4 , July 2014 , pp. 719 - 726
Copyright
Copyright © The Paleontological Society 

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