The Proterozoic Eon witnessed the emergence of some of ... an atmospheric carbon concentration four times higher than modern geologic off-gassing rates seen before 1750, in the pre-Industrial ...

The Proterozoic Eon is also called the Cryptozoic ("age of hidden life"). About 2.5 billion years ago, enough shield rock had formed to start recognizable geologic processes such as plate tectonics.

Since then, biology has been a major agent of geologic change. Earth's third eon, the Proterozoic, beginning 2.5 billion years ago, corresponds roughly to the Great Oxygenation Event when ...

Researchers performed Raman spectral analysis on samples from nine geological formations dating ... atmospheric oxygen levels during the Proterozoic Eon; the study estimates that minimum oxygen ...

First, let’s talk about the history of geologic time itself ... Then 2.5 billion years ago, the Archean gave way to the Proterozoic Eon, meaning ‘earlier life’. And around this time ...

Oddly, there is no other supereon after the Precambrian, just the Phanerozoic eon ranging from ... plus the Archaean and Proterozoic reflects biological innovation and environmental opportunity Better ...

The Cambrian Period is the first geological time period of the Paleozoic ... was gradually warming as the glaciers of the late Proterozoic Eon receded. Tectonic evidence suggests that the single ...

During the Proterozoic eon, some of those microbes became a disruptive ... For the first time in Earth's history, a self-aware geologic force is shaping the planet. Our most immediate challenges ...

With this new study, the chart of life now includes life forms from the Proterozoic Eon, 2,500 million to 539 million years ago. Proterozoic life was generally smaller and squishier -- like sea ...