Eukaryotic organisms radiated in Proterozoic oceans with oxygenated surface waters, but,
commonly, anoxia at depth. Exceptionally preserved fossils of red algae favor crown group …

Oxygenic photosynthesis is Earth's dominant metabolism, having evolved to harvest the
largest expected energy source at the surface of most terrestrial habitable zone planets …

Hopanes and steranes found in Archean rocks have been presented as key evidence
supporting the early rise of oxygenic photosynthesis and eukaryotes, but the syngeneity of …

The evolution of oxygenic photosynthesis had a profound impact on the Earth's surface
chemistry, leading to a sharp rise in atmospheric oxygen between 2.45 and 2.32 billion …

Assembly of the supercontinent Columbia at about 1.85–1.90 Ga coincided with several
events that affected the entire earth. The oldest worldwide network of orogenic belts formed …

The atmosphere has apparently been oxygenated since the 'Great Oxidation Event'ca 2.4
Ga ago, but when the photosynthetic oxygen production began is debatable. However …

The rise of atmospheric O 2 was a milestone in the history of life. Although O 2 itself is not a
climate-active gas, its appearance would have removed a methane greenhouse present on …

The maximum size of organisms has increased enormously since the initial appearance of
life> 3.5 billion years ago (Gya), but the pattern and timing of this size increase is poorly …

The fossil record documents two mutually exclusive macroevolutionary modes separated by
the transitional Ediacaran Period. Despite the early appearance of crown eukaryotes and an …

The Palaeoproterozoic era was a time of profound change in Earth evolution and
represented perhaps the first supercontinent cycle, from the amalgamation and dispersal of …