The long history of life on Earth has unfolded as a cause-and-effect relationship with the
evolving amount of oxygen (O2) in the oceans and atmosphere. Oxygen deficiency …

Abstract The Proterozoic Eon spans Earth's middle age during which many important
transitions occurred. These transitions include the oxygenation of the atmosphere …

Mapping the history of atmospheric O2 during the late Precambrian is vital for evaluating
potential links to animal evolution. Ancient O2 levels are often inferred from geochemical …

The global biosphere is commonly assumed to have been less productive before the rise of
complex eukaryotic ecosystems than it is today. However, direct evidence for this assertion …

Reconstructing historical atmospheric oxygen (O2) levels at finer temporal resolution is a top
priority for exploring the evolution of life on Earth. This goal, however, is challenged by gaps …

Abstract The Proterozoic Eon hosted the emergence and initial recorded diversification of
eukaryotes. Oxygen levels in the shallow marine settings critical to these events were lower …

Resolving how Earth surface redox conditions evolved through the Proterozoic Eon is
fundamental to understanding how biogeochemical cycles have changed through time. The …

The history of atmospheric oxygen through the Mesoproterozoic Era is uncertain, but may
have played a role in the timing of major evolutionary developments among eukaryotes …

Earth's surface has undergone a protracted oxygenation, which is commonly assumed to
have profoundly affected the biosphere. However, basic aspects of this history are still …

It is unclear why atmospheric oxygen remained trapped at low levels for more than 1.5
billion years following the Paleoproterozoic Great Oxidation Event. Here, we use models for …