NOTE: Ages and names used here are based on U.S. Geological Survey Fact Sheet 2007-3015, "Divisions of Geologic Time -- Major Chronostratigraphic and Geochronologic Units", March 2007, ages have been rounded, see publication for precise timeframe. The Cenozoic, Mesozoic, and Paleozoic Eras are part of the Phanerozoic Eon, a column not depicted in this table. |
Erathem or Era | System,Subsystem or Period,Subperiod | Series or Epoch | |||||
65.5 million years ago to Present
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Quaternary
1.8 million years ago to the Present
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Holocene
11,477 years ago (+/- 85 years) to the Present
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Pleistocene
1.8 million to approximately 11,477 (+/- 85 years) years ago
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Tertiary
65.5 to 1.8 million years ago
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Pliocene
5.3 to 1.8 million years ago
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Miocene
23.0 to 5.3 million years ago
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Oligocene
33.9 to 23.0 million years ago
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Eocene
55.8 to 33.9 million years ago
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Paleocene
65.5 to 58.8 million years ago
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Erathem or Era | System,Subsystem or Period,Subperiod | Series or Epoch | |||
Mesozoic
251.0 to 65.5 million years ago
|
Cretaceous
145.5 to 65.5 million years ago
|
Late or Upper | |||
Early or Lower | |||||
Jurassic
199.6 to 145.5 million years ago
|
Late or Upper | ||||
Middle | |||||
Early or Lower | |||||
Triassic
251.0 to 199.6 million years ago
|
Late or Upper | ||||
Middle | |||||
Early or Lower |
Erathem or Era | System,Subsystem or Period,Subperiod | Series or Epoch | |||||
Paleozoic
542.0 to 251.0 million years ago
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Permian
299.0 to 251.0 million years ago
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Lopingian | |||||
Guadalupian | |||||||
Cisuralian | |||||||
Carboniferous
359.2 to 299.0 million years ago
|
Pennsylvanian
318.1 to 299.0 million years ago
|
Late or Upper | |||||
Middle | |||||||
Early or Lower | |||||||
Mississippian
359.2 to 318.1 million years ago
|
Late or Upper | ||||||
Middle | |||||||
Early or Lower | |||||||
Devonian
416.0 to 359.2 million years ago
|
Late or Upper | ||||||
Middle | |||||||
Early or Lower | |||||||
Silurian
443.7 to 416.0 million years ago
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Pridoli | ||||||
Ludlow | |||||||
Wenlock | |||||||
Llandovery | |||||||
Ordovician
488.3 to 443.7 million years ago
|
Late or Upper | ||||||
Middle | |||||||
Early or Lower | |||||||
Cambrian
542.0 to 488.3 million years ago
|
Late or Upper | ||||||
Middle | |||||||
Early or Lower |
Precambrian ***
approximately 4 billion years ago to 542.0 million years ago
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Resources:
Table compiled and/or modified by: Lyn Topinka, USGS/CVO, 1997, 2000, 2001, 2006, 2008, with names and ages modified in 2008 to match U.S. Geological Survey Fact Sheet 2007-3015, "Divisions of Geologic Time -- Major Chronostratigraphic and Geochronologic Units", March 2007.
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