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Archean molecular fossils and the early rise of eukaryotes.
The presence of steranes, particularly cholestane and its 28- to 30-carbon analogs, provides persuasive evidence for the existence of eukaryotes 500 million to 1 billion years before the extant fossil record indicates that the lineage arose.
When did oxygenic photosynthesis evolve?
- R. Buick
- Environmental Science, GeologyPhilosophical Transactions of the Royal Society B…
- 27 August 2008
The hypothesis that oxygenic photosynthesis evolved well before the atmosphere became permanently oxygenated seems well supported, and could have arisen by the start of the geological record.
A Whiff of Oxygen Before the Great Oxidation Event?
High-resolution chemostratigraphy reveals an episode of enrichment of the redox-sensitive transition metals molybdenum and rhenium in the late Archean Mount McRae Shale in Western Australia, pointing to the presence of small amounts of O2 in the environment more than 50 million years before the start of the Great Oxidation Event.
The antiquity of oxygenic photosynthesis: evidence from stromatolites in sulphate-deficient Archaean lakes.
- R. Buick
- Environmental ScienceScience
- 3 January 1992
The Tumbiana Formation, about 2700 million years old, was largely deposited in ephemeral saline lakes, as judged by the unusual evaporite paragenesis of carbonate and halite with no sulfate.…
Isotopic evidence for microbial sulphate reduction in the early Archaean era
The results extend the geological record of microbial sulphate reduction back more than 750 million years, and represent direct evidence of an early specific metabolic pathway—allowing time calibration of a deep node on the tree of life.
Stromatolites 3,400–3,500 Myr old from the North Pole area, Western Australia
Stromatolites are the least controversial evidence of early life; they are organosedimentary structures resulting from the growth and metabolic activity of microorganisms1. Before this report,…
A reconstruction of Archean biological diversity based on molecular fossils from the 2.78 to 2.45 billion-year-old Mount Bruce Supergroup, Hamersley Basin, Western Australia
Late Archean Biospheric Oxygenation and Atmospheric Evolution
The correlation of the time-series sulfur isotope signals in northwestern Australia with equivalent strata from South Africa suggests that changes in the exogenic sulfur cycle recorded in marine sediments were global in scope and were linked to atmospheric evolution.
Record of emergent continental crust ∼3.5 billion years ago in the Pilbara craton of Australia
ISOTOPIC data for the Earth's oldest rocks17 imply that a considerable volume of continental crust existed during the early Archaean aeon (>3.0 Gyr ago), but it is not known when this crust first…
Air density 2.7 billion years ago limited to less than twice modern levels by fossil raindrop imprints
It is shown that raindrop imprints in tuffs of the Ventersdorp Supergroup, South Africa, constrain surface air density 2.7 billion years ago to less than twice modern levels, rendering the pressure broadening explanation possible, but it is improbable under the likely lower estimates.