Oxygen dynamics in the aftermath of the Great Oxidation of Earth’s atmosphere
An international team involving several French laboratories (1), coordinated by Pr El Albani of the Poitiers Chemistry Institute : media and materials (IC2MP) (CNRS / Université de Poitiers) reconstructed changes in the oxygen content of the atmosphere Earth during a crucial period of its history: between 2.3 and 2 billion years. The results show fluctuations and dynamic “yoyo” oxygen during this period. They begin with a strong increase in its content and ends with a significant drop. A decisive impetus to the evolution of life on our planet implications. This work is published this week on the website of the journal Proceeding of the National Academy of Sciences of the United States of America (PNAS).
Read the article in NewScience and Space : New samples show sharp decline in oxygen after the Great Oxidation Event
– New evidence suggests Earth’s oxygen levels fell after the Great Oxidation Event – Phys.org, ocober 2013
– Evidence of Oxygen in Earth’s Atmosphere Found in 3 Billion-Year-Old Soil.
Oxygen may have been accumulating in Earth’s atmosphere hundreds of millions of years earlier than we thought…
Relics of some of the first stirrings of modern life may have been uncovered.
Scientists report in the journal Nature the discovery of centimetre-sized fossils they suggest are the earliest known examples of multicellular life.
The specimens, from Gabon, are 2.1 billion years old – 200 million years older than for any previous claim.
Abderrazak El Albani and colleagues describe the fossils’ distinctive appearance as resembling irregularly shaped “wrinkly cookies”… read the article
And more about…
– Earliest traces of complex life? Alan Boyle, Science Editor, NBC News
Scientists say they’ve discovered cookie-shaped fossils in Gabon that may represent the earliest-known multicellular life, dating back 2.1 billion years. But when you go that far back, claims about fossilized life get complicated.For one thing, we’re talking about multicellular life: The traces of microbial life appear to go even further back in time – to 3.45 billion years ago… read the article
– French scientists have discovered fossils that suggest that multi-cellular life appeared on earth far earlier than originally believed. Let’s see what they’ve unearthed. Par NTDTelevision 15th of july 2010.
French Scientists Discover Important Time… par NTDTV– From outer to inner structural morphology. 3D imaging and quantitative characterization of fossil remains, with special reference to the 2.1 Ga macroorganisms of Gabon, by Pr Macchiarelli – Université de Poitiers & MNHN Paris .