Stage (stratigraphy)

•  Cenozoic

  The Cenozoic (also Cænozoic or Cainozoic) Era (meaning "new life", is the most recent of the three classic geological eras and covers the period from 65.5 million years ago to the present. It is marked by the Cretaceous–Tertiary extinction event at the end of the Cretaceous that saw the demise of the last non-avian dinosaurs and the end of the Mesozoic Era. The Cenozoic era is ongoing.

  

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•  Ediacaran

  The Ediacaran Period is the last geological period of the Neoproterozoic Era and of the Proterozoic Eon, immediately preceding the Cambrian Period, the first period of the Paleozoic Era and of the Phanerozoic Eon. Its status as an official geological period was ratified in 2004 by the International Union of Geological Sciences (IUGS), making it the first new geological period declared in 120 years. The type section is in the Flinders Ranges in South Australia.

  

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•  Global Boundary Stratotype Section and Point

  A Global Boundary Stratotype Section and Point, abbreviated GSSP, is an internationally agreed upon stratigraphic section which serves as the reference section for a particular boundary on the geologic time scale. The effort to define GSSPs is conducted by the International Commission on Stratigraphy, a part of the International Union of Geological Sciences. Most, but not all, GSSPs are based on paleontological changes.

  

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•  Geologic time scale

  The geologic time scale provides a system of chronologic measurement relating stratigraphy to time that is used by geologists, paleontologists and other earth scientists to describe the timing and relationships between events that have occurred during the history of the Earth. The table of geologic time spans presented here agrees with the dates and nomenclature proposed by the International Commission on Stratigraphy, and uses the standard color codes of the United States Geological Survey.

  

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•  Paleogene

  The Paleogene (alternatively Palæogene, informally Lower Tertiary) is a geologic period and system that began 65.5 ± 0.3 and ended 23.03 ± 0.05 million years ago and comprises the first part of the Cenozoic Era. Lasting 42 million years, the Paleogene is most notable as being the time in which mammals evolved from relatively small, simple forms into a plethora of diverse animals in the wake of the Cretaceous–Tertiary extinction event that ended the preceding Cretaceous Period.

  

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•  Phanerozoic

  The Phanerozoic (Brit. Phanærozoic) Eon is the current eon in the geologic timescale, and the one during which abundant animal life has existed. It covers roughly 545 million years and goes back to the time when diverse hard-shelled animals first appeared. Its name is derived from the Greek words φαίνω and ζωή, meaning make life appear, since it was once believed that life began in the Cambrian, the first period of this eon.

  

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•  Hadean

  The Hadean is the geologic eon before the Archean. It started at Earth's formation about 4.6 billion years ago, and ended roughly 3.8 billion years ago, though the latter date varies according to different sources. The name "Hadean" derives from Hades, Greek for "Underworld", referring to the conditions on Earth at the time. The geologist Preston Cloud coined the term in 1972, originally to label the period before the earliest-known rocks. W.

  

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•  Archean

  The Archean (also spelled Archaean, formerly called the Archaeozoic, also spelled Archeozoic or Archæozoic) is a geologic eon before the Paleoproterozoic Era of the Proterozoic Eon, before 2.5 Ga (billion years ago, or 2,500). Instead of being based on stratigraphy, this date is defined chronometrically. The lower boundary (starting point) has not been officially recognized by the International Commission on Stratigraphy, but it is usually set to 3.8 Ga, at the end of the Hadean Eon.

  

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•  Paleoproterozoic

  The Paleoproterozoic (also spelled Palaeoproterozoic) is the first of the three sub-divisions of the Proterozoic occurring between 1,600 to 2,500 million years ago. This is when the continents first stabilized. This is also when Cyanobacteria evolved, a type of bacteria which uses the biochemical process of photosynthesis to produce energy and oxygen.

  

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•  Mesoproterozoic

  The Mesoproterozoic Era is a geologic era that occurred between 1600 Ma and 1000 Ma (million years ago). The major events of this era are the formation of the Rodinia supercontinent, the breakup of the Columbia supercontinent, and the evolution of sexual reproduction.

  

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• Geologic time scale by likeorhate
• Earth sciences by likeorhate
• Geochronology by likeorhate
• Geology timelines by likeorhate
• Historical geology by likeorhate
• Paleogeography by likeorhate
• Stratigraphy by likeorhate
• Units of time by likeorhate

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•  Ahmed al Masli

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•  Gone (Switchfoot Song)

  

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