Cited by 158Paleontology and Stratigraphy of FossilsOrigins and Evolution of LifeEvolution and Paleontology Studies

The Paleoproterozoic fossil record: Implications for the evolution of the biosphere during Earth's middle-age

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Javaux, Emmanuelle J., Lepot, Kevin·2018·Earth-Science Reviews

Abstract

The Paleoproterozoic (2.5–1.6 Ga) Era is a decisive time in Earth and life history. The paleobiological record (microfossils, stromatolites, biomarkers and isotopes) illustrates the biosphere evolution during a time of transitional oceanic and atmosphere chemistries. Benthic microfossil assemblages are recorded in a variety of oxygenated, sulfidic, and ferruginous environments representative of the spatial heterogeneities and temporal variations characteristic of this Era. The microfossil assemblages include iron-metabolizing and/or iron-tolerant prokaryotes, sulfur-metabolizing prokaryotes, cyanobacteria, other undetermined prokaryotes, and eukaryotes. The undetermined microfossils represent a majority of the assemblages and thus raise a challenge to determine the nature and role of microorganisms in these changing environments. Despite the early evolution of the eukaryotic cellular toolkit, early eukaryotic crown group diversification may have been restrained in the Paleoproterozoic by ocean chemistry conditions, but it increased during the late Mesoproterozoic–early Neoproterozoic despite the continuation of similar conditions through the (miscalled) “boring billion”, then amplified significantly (but perhaps within lower taxonomic levels), with the demise of euxinic conditions and increase in ecological complexity. The emerging picture is one of a changing and more complex biosphere in which the three domains of life, Archaea, Bacteria and Eukarya, were diversifying in various ecological niches marked by the diversification of identified microfossils, stromatolites, increasing abundance of preserved biomarkers, and appearance of macroscopic problematic fossils or trace fossils.

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Crossref · 10.1016/j.earscirev.2017.10.001

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Authors
Javaux, E. J., & Lepot, K.
Affiliations
University of Liège (BE)
Corresponding author
Javaux, Emmanuelle J.
Venue
Earth-Science Reviews
Publisher
Elsevier BV
Published
2018-01
Volume
176
Pages
68-86
ISSN
0012-8252 (ISSN-L)
OpenAlex
W2764092185
Cited by
158
References
284
Citations by year
2026: 12 · 2025: 15 · 2024: 16 · 2023: 25 · 2022: 22 · 2021: 33 · 2020: 13 · 2019: 14 · 2018: 8
FWCI
6.83
Type
journal article
Language
en
Open access
Locations
  • Earth-Science Reviews (publishedVersion, cc-by-nc-nd)
  • Flanders Marine Institute (Flanders Marine Institute) (publishedVersion, other-oa)
  • HAL (submittedVersion, cc-by-nc)
  • LillOA (Université de Lille (University Of Lille)) (submittedVersion, other-oa)
  • ORBi (University of Liège) (submittedVersion, other-oa)
Funders
  • Région Hauts-de-France (iM4)
  • European Research Council (308074)
  • Fondation Francqui
  • Fonds De La Recherche Scientifique - FNRS (FRFC 2.4.558.09)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Origins and Evolution of Life
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
Keywords
Paleoproterozoic, fossil record, biosphere evolution, benthic microfossils, stromatolites, biomarkers, atmospheric oxygenation, euxinia, cyanobacteria, eukaryotic diversification, trace fossils, early eukaryotes, Mesoproterozoic

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