Change search
ReferencesLink to record
Permanent link

Direct link
The 2.1 Ga old Francevillian biota: biogenicity, taphonomy and biodiversity.
Swedish Museum of Natural History, Department of Paleobiology.
Show others and affiliations
2014 (English)In: PLoS ONE, ISSN 1932-6203, Vol. 9, no 6:e99438, 1-18 p.Article in journal (Refereed) Published
Abstract [en]

The Paleoproterozoic Era witnessed crucial steps in the evolution of Earth’s surface environments following the first appreciable rise of free atmospheric oxygen concentrations ~2.3 to 2.1 Ga ago, and concomitant shallow ocean oxygenation. While most sedimentary successions deposited during this time interval have experienced thermal overprinting from burial diagenesis and metamorphism, the ca. 2.1 Ga black shales of the Francevillian B Formation (FB2) cropping out in southeastern Gabon have not. The Francevillian Formation contains centimeter-sized structures interpreted as organized and spatially discrete populations of colonial organisms living in an oxygenated marine ecosystem. Here, new material from the FB2 black shales is presented and analyzed to further explore its biogenicity and taphonomy. Our extended record comprises variably sized, shaped, and structured pyritized macrofossils of lobate, elongated, and rodshaped morphologies as well as abundant non-pyritized disk-shaped macrofossils and organic-walled acritarchs. Combined microtomography, geochemistry, and sedimentary analysis suggest a biota fossilized during early diagenesis. The emergence of this biota follows a rise in atmospheric oxygen, which is consistent with the idea that surface oxygenation allowed the evolution and ecological expansion of complex megascopic life.

Place, publisher, year, edition, pages
2014. Vol. 9, no 6:e99438, 1-18 p.
Keyword [en]
Palaeoproterozoic, Gabon, Francevillian, fossils, colonies, multicellularity, oxygen, evolution
National Category
Natural Sciences
Research subject
Diversity of life
URN: urn:nbn:se:nrm:diva-571DOI: 10.1371/journal.pone.0099438OAI: diva2:739304
Swedish Research Council, 2010-3929
Available from: 2014-08-20 Created: 2014-08-20 Last updated: 2014-08-20Bibliographically approved

Open Access in DiVA

fulltext(2765 kB)135 downloads
File information
File name FULLTEXT01.pdfFile size 2765 kBChecksum SHA-512
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Search in DiVA

By author/editor
Bengtson, StefanWhitehouse, Martin
By organisation
Department of PaleobiologyDepartment of Geology
In the same journal
Natural Sciences

Search outside of DiVA

GoogleGoogle Scholar
Total: 135 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 50 hits
ReferencesLink to record
Permanent link

Direct link