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Increase in Earth's oxygen
Increase in Earth's oxygen
The Paleoproterozoic Era is first era in the Proterozoic Eon, occurring after the Neoarchean Period, and before the Mesoproterozoic Era.
Geologic Age
Geologic Age
2,500–1,600 million years ago
Subdivisions
Subdivisions
Statherian Period: 1,800–1,600 Ma
Orosirian Period: 2,050–1,800 Ma
Rhyacian Period: 2,300–2,050 Ma
Siderian Period: 2,500–2,300 Ma
Eon
Eon
What happened during this time?
What happened during this time?
Geological
Geological
Continents and crust stabilized
Supercontinent, named Columbia, starts to form (1.5-2.0 Ga)
Earth had about 450 days in a year, and 20-hour days
Oxygen levels continue to increase
Biological
Biological
Cyanobacteria flourish along coastlines
First reported green sulfur bacteria
First acritarchs appear around 1.8 Ga
Many anaerobic bacteria go extinct
First possible eukaryotes (Grypania) arise around 2.1 Ga
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