Distinctive microfossil supports early Paleoproterozoic rise in complex cellular organisation

Author:

Barlow Erica V.123ORCID,House Christopher H.3,Liu Ming‐Chang45,Wetherington Maxwell T.6,Van Kranendonk Martin J.12

Affiliation:

1. Australian Centre for Astrobiology, School of Biological, Earth and Environmental Sciences University of New South Wales Kensington New South Wales Australia

2. Australian Research Council Centre of Excellence for Core to Crust Fluid Systems (CCFS) Macquarie University Sydney New South Wales Australia

3. Department of Geosciences and the Earth and Environmental Systems Institute Pennsylvania State University University Park Pennsylvania USA

4. Department of Earth, Planetary, and Space Sciences University of California at Los Angeles Los Angeles California USA

5. Lawrence Livermore National Laboratory Livermore California USA

6. Materials Research Institute and Department of Materials Science & Engineering Pennsylvania State University University Park Pennsylvania USA

Abstract

AbstractThe great oxidation event (GOE), ~2.4 billion years ago, caused fundamental changes to the chemistry of Earth's surface environments. However, the effect of these changes on the biosphere is unknown, due to a worldwide lack of well‐preserved fossils from this time. Here, we investigate exceptionally preserved, large spherical aggregate (SA) microfossils permineralised in chert from the c. 2.4 Ga Turee Creek Group in Western Australia. Field and petrographic observations, Raman spectroscopic mapping, and in situ carbon isotopic analyses uncover insights into the morphology, habitat, reproduction and metabolism of this unusual form, whose distinctive, SA morphology has no known counterpart in the fossil record. Comparative analysis with microfossils from before the GOE reveals the large SA microfossils represent a step‐up in cellular organisation. Morphological comparison to extant micro‐organisms indicates the SAs have more in common with coenobial algae than coccoidal bacteria, emphasising the complexity of this microfossil form. The remarkable preservation here provides a unique window into the biosphere, revealing an increase in the complexity of life coinciding with the GOE.

Funder

Centre of Excellence for Core to Crust Fluid Systems, Australian Research Council

National Science Foundation

Publisher

Wiley

Subject

General Earth and Planetary Sciences,General Environmental Science,Ecology, Evolution, Behavior and Systematics

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