Search results
Results from the WOW.Com Content Network
The Paleoproterozoic Era [4] (also spelled Palaeoproterozoic) is the first of the three sub-divisions of the Proterozoic eon, and also the longest era of the Earth's geological history, spanning from (2.5–1.6 Ga).
The Proterozoic Eon was a very tectonically active period in the Earth's history. Oxygen changed the chemistry allowing for extensive geological changes. Volcanism was also extensive resulting in more geologic changes. The late Archean Eon to Early Proterozoic Eon corresponds to a period of increasing crustal recycling, suggesting subduction.
Animation of the break-up of the supercontinent Pangaea and the subsequent drift of its constituents, from the Early Triassic to recent (250 Ma to 0).. This is a list of paleocontinents, significant landmasses that have been proposed to exist in the geological past.
The Great Oxidation Event (GOE) or Great Oxygenation Event, also called the Oxygen Catastrophe, Oxygen Revolution, Oxygen Crisis or Oxygen Holocaust, [2] was a time interval during the Earth's Paleoproterozoic era when the Earth's atmosphere and shallow seas first experienced a rise in the concentration of free oxygen. [3]
The Siderian Period (/ s aɪ ˈ d ɪər i. ə n, s ɪ-/; Ancient Greek: σίδηρος, romanized: sídēros, meaning "iron") is the first geologic period in the Paleoproterozoic Era and lasted from 2500 Ma to 2300 Ma. Instead of being based on stratigraphy, these dates are defined chronometrically.
The Rhyacian Period (/ r aɪ ˈ eɪ s i. ə n /; Ancient Greek: ῥύαξ, romanized: rhýax, meaning "stream of lava") is the second geologic period in the Paleoproterozoic Era and lasted from 2300 Mya to 2050 Mya (million years ago). [2] Instead of being based on stratigraphy, these dates are defined chronometrically. [3]
The Statherian Period (/ s t ə ˈ θ ɪər i ən /; Ancient Greek: σταθερός, romanized: statherós, meaning "stable, firm") is the final geologic period in the Paleoproterozoic Era and lasted from 1800 Mya to 1600 Mya (million years ago). Instead of being based on stratigraphy, these dates are defined chronometrically.
The Orosirian Period (/ ˌ ɒr oʊ ˈ s ɪər i ən /; Ancient Greek: ὀροσειρά, romanized: oroseirá, meaning "mountain range") is the third geologic period in the Paleoproterozoic Era and lasted from 2050 Mya to 1800 Mya (million years ago). [2] Instead of being based on stratigraphy, these dates are defined chronometrically.