The atmosphere of the Archean eon—one-third of Earth's history—is important for
understanding the evolution of our planet and Earth-like exoplanets. New geological proxies …

Abstract The Archean era (4 to 2.5 billion years ago, Ga) yielded rocks that include the
oldest conclusive traces of life as well as many controversial occurrences. Carbonaceous …

The rate of primary productivity is a keystone variable in driving biogeochemical cycles
today and has been throughout Earth's past. 1 For example, it plays a critical role in …

Production of molecular oxygen was a turning point in the Earth's history. The geological
record indicates the Great Oxidation Event, which marked a permanent transition to an …

Oxygenic photosynthesis is arguably the most important biological innovation in Earth's
history, facilitating the transition to a habitable planet for complex life. Dating the emergence …

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

Late Archaean sedimentary rocks contain compelling geochemical evidence for episodic
accumulation of dissolved oxygen in the oceans along continental margins before the Great …

The rise of oxygen on the early Earth about 2.4 billion years ago reorganized the redox cycle
of harmful metal (loids), including that of arsenic, which doubtlessly imposed substantial …

The rise of molecular oxygen (O2) in the atmosphere and oceans was one of the most
consequential changes in Earth's history. While most research focuses on the Great …

Life on Earth has existed for over 3.5 billion years and has caused fundamental changes in
Earth's biogeochemistry. However, the timing and impact of major events in the evolution of …