Journal ArticleDOI
Filamentous fossil bacteria from the Archean of Western Australia
TLDR
In this paper, four morphotypes of structurally preserved, filamentous fossil bacteria have been discovered in petrographic thin sections of laminated, carbonaceous cherts from the ~3500 Ma-old Warrawoona Group of northwestern Australia.About:
This article is published in Precambrian Research.The article was published on 1983-06-01. It has received 285 citations till now. The article focuses on the topics: Warrawoona Group & Archean.read more
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Microbial carbonates: the geological record of the calcified bacterial-algal mats and biofilms
TL;DR: For example, in this article, the main component is dense, clotted or peloidal micrite resulting from calcification of bacterial cells, sheaths and biofilm, and from phytoplankton-stimulated whiting nucleation.
Journal ArticleDOI
Microfossils of the Early Archean Apex Chert: New Evidence of the Antiquity of Life
TL;DR: It is established that trichomic cyanobacterium-like microorganisms were extant and morphologically diverse at least as early as ∼3465 million years ago and suggests that oxygen-producing photoautotrophy may have already evolved by this early stage in biotic history.
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Early Archean (3.3-Billion to 3.5-Billion-Year-Old) Microfossils from Warrawoona Group, Australia
J. W. Schopf,BM Packer +1 more
TL;DR: Cellularly preserved filamentous and colonial fossil microorganisms have been discovered in bedded carbonaceous cherts from the Early Archean Apex Basalt and Towers Formation of northwestern Western Australia, suggesting that cyanobacteria, and therefore oxygen-producing photosynthesis, may have been extant as early as 3.3 billion to 3.5 billion years ago.
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The Paleoproterozoic snowball Earth: A climate disaster triggered by the evolution of oxygenic photosynthesis
TL;DR: In this article, a simple growth model incorporating the range of C, Fe, and P fluxes expected during a partial glaciation in an anoxic world with high-Fe oceans indicates that oxygenic photosynthesis could have destroyed a methane greenhouse and triggered a snowball event on timescales as short as 1 million years.
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Evolutionary relationships among cyanobacteria and green chloroplasts.
TL;DR: The results indicate that many diverse forms of cyanobacteria diverged within a short span of evolutionary distance and suggest that the chloroplast lineage, which includes the cyanelle of C. paradoxa, is not just a sister group to the free-living forms but rather is contained within the cyanobacterial radiation.
References
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Journal ArticleDOI
The crack–seal mechanism of rock deformation
TL;DR: Many naturally deformed crustal rocks contain mineral-filled extension veins and the crystals making up the vein filling often show a fibrous habit and seem to be built up by a succession of "crack-seal" increments: the elastically deforming rock fails by fracture, and the walls of the open micro-crack are sealed together by crystalline material derived by pressure solution in the rock matrix as mentioned in this paper.
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Endolithic Microorganisms in the Antarctic Cold Desert
TL;DR: In the frigid desert of the Antarctic dry valleys there are no visible life forms on the surface of the soil or rocks, yet in certain rock types a narrow subsurface zone has a favorable microclimate and is colonized by microorganisms.
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Microorganisms from the Gunflint Chert: These structurally preserved Precambrian fossils from Ontario are the most ancient organisms known.
Journal Article
Microflora of the Bitter Springs Formation, late Precambrian, central Australia
TL;DR: In this article, 30 new species, representing 24 new genera, of green algae, blue-green algae, colonial bacteria, fungus-like filaments, and possible pyrrophytes, are described from the bedded carbonaceous cherts of the late Precambrian Bitter Springs formation, Ross river area, central Australia.
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Stromatolites 3,400–3,500 Myr old from the North Pole area, Western Australia
TL;DR: Stromatolites are the least controversial evidence of early life; they are organosedimentary structures resulting from the growth and metabolic activity of microorganisms as discussed by the authors, and the oldest well established occurrence was in the 2,900-3,000 Myr Pongola Supergroup of South Africa; five or six additional occurrences are known from the later Archean3.
Related Papers (5)
Microfossils of the Early Archean Apex Chert: New Evidence of the Antiquity of Life
Early Archean (3.3-Billion to 3.5-Billion-Year-Old) Microfossils from Warrawoona Group, Australia
J. W. Schopf,BM Packer +1 more