Paleosol
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In geoscience, paleosol is an ancient soil that formed in the past. The definition of the term in geology and paleontology is slightly different from its use in soil science.
Paleosols sequence, Tuscany, Italy
Etched section of paleosol from the Atlantic, San Salvador Island, Bahamas, indicating the top of the Pleistocene Grotto Beach Formation (limestone)
Blocky angular peds in an Eocene paleosol
Granular peds in an Oligocene paleosol
Great Oxidation Event
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The Great Oxidation Event or Great Oxygenation Event, also called the Oxygen Catastrophe, Oxygen Revolution, Oxygen Crisis, or Oxygen Holocaust, was a time interval during the Earth's Paleoproterozoic
2.1 billion year old rock showing banded iron formation