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. |
Eon | Erathem or Era | System,Subsystem or Period,Subperiod | Series or Epoch | |||||
h a n e r o z o i c |
65.5 million years ago to Present
|
Quaternary
1.8 million years ago to the Present
|
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
|
||||||||
Tertiary
65.5 to 1.8 million years ago
|
Pliocene
5.3 to 1.8 million years ago
|
|||||||
Miocene
23.0 to 5.3 million years ago
|
||||||||
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
|
Eon | Erathem or Era | System,Subsystem or Period,Subperiod | Series or Epoch | |||
h a n e r o z o i c |
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 |
Eon | Erathem or Era | System,Subsystem or Period,Subperiod | Series or Epoch | |||||
h a n e r o z o i c |
Paleozoic
542.0 to 251.0 million years ago
|
Permian
299.0 to 251.0 million years ago
|
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
|
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
|
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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