Nitrogen is an essential nutrient for all life on Earth and it acts as a major control on
biological productivity in the modern ocean. Accurate reconstructions of the evolution of life …

“The Answer to the Great Question... Of Life, the Universe and Everything... Is... Forty-two,”
said Deep Thought, with infinite majesty and calm…“I checked it very thoroughly,” said the …

It is widely assumed that atmospheric oxygen concentrations remained persistently low (less
than 10− 5 times present levels) for about the first 2 billion years of Earth's history. The first …

Sedimentary pyrite formed in the water column, or during diagenesis in organic muds,
provides an accessible proxy for seawater chemistry in the marine rock record. Except for …

The nine editions of Stable Isotope Geochemistry have appeared over a time span of nearly
50 years. The first edition (1973) appeared as a slim book of 135 pages. Due to the rapid …

The early diversification of animals (∼ 630 Ma), and their development into both motile and
macroscopic forms (∼ 575–565 Ma), has been linked to stepwise increases in the …

The oxygen content of the Earth's surface environment is thought to have increased in two
broad steps: the Great Oxygenation Event (GOE) around the Archean–Proterozoic boundary …

Construction and assembly of the Geologic Time Scale involves:(a) constructing a relative
(chronostratigraphic) standard scale for key periods in the Earth's rock record;(b) identifying …

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 …

Geochemical data,,, suggest that oxygenation of the Earth's atmosphere occurred in two
broad steps. The first rise in atmospheric oxygen is thought to have occurred between∼ …