Bacterial fossils and microbial dolomite in Triassic stromatolites
Open accessAbstract
Triassic stromatolitic dolomite from Italy preserves mineralized bacterial remains, one of the first unequivocal identifications of such structures in the geological record. They consist of empty spheroids 1.0 µm diameter resembling coccoid bacteria, and smaller, 150–400 nm, objects interpreted as dwarf bacterial forms, occurring within and between syn-sedimentary dolomite crystals. Moreover, gently folded sheets, 100–200 nm thick and several micrometers long, form a sub-polygonal network reminiscent of EPS (extracellular polymeric substance). Their granular-textured surfaces suggest bacterial degradation of original organic matter. These features confirm a biological origin for the stromatolites, as in modern microbial mats, and the preserved original geochemical signatures indicate early precipitation of Mg-carbonates induced through microbial sulfate-reducing metabolic activities.
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Nanoparticle aggregates have been observed in Holocene dolomites, as well as in some ancient dolomites.
“Nanoparticle aggregates have been observed in Holocene dolomites (e.g., Bontognali et al., 2010;Nyirö-Kása et al., 2018;Raudsepp et al., 2022), as well as in some ancient dolomites (Perri and Tucker, 2007;Sánchez-Román et al., 2008;Sun et al., 2023).”
From A non-classical crystallization mechanism of microbially-induced disordered dolomite (2024) · cites this paper as Perri and Tucker, 2007
This unique morphology and texture were considered as potential biomarkers suggesting microbial activity or presence of fossilized bacteria or viruses.
“This unique morphology and texture were considered as potential biomarkers suggesting microbial activity or the presence of fossilized bacteria or viruses (e.g., Perri and Tucker, 2007;Sun et al., 2023).”
From A non-classical crystallization mechanism of microbially-induced disordered dolomite (2024) · cites this paper as Perri and Tucker, 2007
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References 31 · Cited by 140
- Authors
- Perri, E., & Tucker, M.
- Affiliations
- University of Calabria (IT)
- Durham University (GB)
- Venue
- Geology
- Publisher
- Geological Society of America
- Published
- 2007
- Volume
- 35
- Issue
- 3
- Pages
- 207
- ISSN
- 0091-7613 (ISSN-L)
- OpenAlex
- W2077873201
- Cited by
- 140
- References
- 31
- Citations by year
- 2026: 6 · 2025: 6 · 2024: 13 · 2023: 14 · 2022: 9 · 2021: 8 · 2020: 13 · 2019: 8 · 2018: 4 · 2017: 11 · 2016: 6 · 2015: 5 · 2014: 7 · 2013: 6 · 2012: 7
- FWCI
- 2.53
- Type
- journal article
- Language
- en
- Open access
- Licence
- cc-by
- Locations
- Geology (publishedVersion)
- Durham Research Online (Durham University) (acceptedVersion)
- Durham Research Online (Durham University) (submittedVersion, cc-by)
- Archive of Doctoral Theses and Digital Collections (University of Calabria) (submittedVersion)
- Funders
- Durham University
- Ministero dell'Università e della Ricerca
- 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 › Earth-Surface Processes › Geological formations and processes
- Keywords
- stromatolites, Triassic, coccoid bacteria, extracellular polymeric substances, microbial sulfate reduction, magnesium carbonate precipitation, microbial mats
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