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Scientists use geological periods as the time scale that defines the history of the Earth. The surface of the Earth is made up of layers of rock, with the most recent layers on top. Fossils found in these rock layers can provide clues to what the planet was like far back in history.
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Fast Facts
- Major Divisons: Eons and Eras
- Subdivisions: Periods, Epochs, and Stages
- Cover the evolution and extinction of plants and animals
- Go back an estimated 4.5 billion yearsIdaho Museum of Natural History: Geologic Time
- Document five "great extinctions" that wiped out many speciesTimerock: Geological Periods
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Geological Periods Notable Events
- 3.8 to 2.6 billion years ago: Life on Earth began in the Archaean Era with bacteria
- 590 to 505 million years ago: First multi-celled Animals appeared in the Cambrian Period of the Paleozoic Era
- 248 to 66.4 million years ago: Dinosaurs lived in the Mesozoic Era
- 44 to 66.4 million years ago: First mammals lived in the Cretaceous Period of the Mesozoic Era
- 1.8 million to 10,000 years ago: Homo Sapiens appeared in the Pleistocene Period of the Cenozoic Era
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Dinosaurs | Geology | Paleontology | Fossils | Evolution | Jurassic | Triassic | Cretaceous | North Pole
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Timerock: Geological Periods
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United States Geological Survey: Geological Time Scale
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Idaho Museum of Natural History: Geologic Time
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Wikipedia: Geologic Timescale
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Virtual Fossil Museum: Geological Periods
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University of California Museum of Paleontology: Geological Periods
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YouTube Video: Cambrian Age (Time: 4:57)
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Timerock: Geological Periods
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Geological Periods on Twitter Powered by Twitter
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@PhilipMooney Haha yep! Have you hiked Mt Diablo's "Trail through time"? Takes you through a bunch of cool geological time periods.
@travisvanhalen | November 06, 2009 05:07 PM -
Intermediate fauna between geological periods – a snippet of wisdom from On The Origin Of #Species by Cha.. http://bit.ly/1S4DRE
@originspecies | November 04, 2009 06:07 PM -
Intermediate fauna between geological periods – a snippet of wisdom from On The Origin Of #Species by Cha.. http://bit.ly/2LvUkh
@extinctionzone | November 04, 2009 06:07 PM -
Intermediate fauna between geological periods – a snippet of wisdom from On The Origin Of #Species by Cha.. http://bit.ly/1S4DRE
@fishsnorkel | November 04, 2009 05:58 PM -
Intermediate fauna between geological periods – a snippet of wisdom from On The Origin Of #Species by Cha.. http://bit.ly/2LvUkh
@originofdestiny | November 04, 2009 05:44 PM
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Geological Periods on Amazon | View All
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The seismicity of Indiana described by return periods of earthquake intensities (Geological Survey occasional paper ; 16)
Amazon.com: The seismicity of Indiana described by return periods of earthquake intensities (Geological Survey occasional paper ; 16): Robert F Blakely: Books
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Three component long-period data for the 1949 South Puget Sound, Washington earthquake (Open-file report / United States Department of the Interior, Geological Survey)
Amazon.com: Three component long-period data for the 1949 South Puget Sound, Washington earthquake (Open-file report / United States Department of the Interior, Geological Survey): Glenn Eli Baker: Books
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Structural geography of Ireland: An elementary geology, with notes on the different kinds of rock, and tables of the geological eras and periods
Amazon.com: Structural geography of Ireland: An elementary geology, with notes on the different kinds of rock, and tables of the geological eras and periods: Elenor Butler: Books
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The cause of the glacial period and an explanation of geological climates, (Technical Society of the Pacific Coast. Transactions)
Amazon.com: The cause of the glacial period and an explanation of geological climates, (Technical Society of the Pacific Coast. Transactions): Marsden Manson: Books
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History of Wiskonsan,: From its first discovery to the present period. Including a geological and topographical description of the territory, with a correct catalogue of all its plants
Amazon.com: History of Wiskonsan,: From its first discovery to the present period. Including a geological and topographical description of the territory, with a correct catalogue of all its plants: Donald M'Leod: Books
Amazon
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Questions and Answers About Geological Periods | View All | Ask a Question
View All Geological Periods Questions (212) | Ask a QuestionCan CLONAZEPAM, and BUDEPRION Cause A Missed Period? (1 Answer)Clonazepam side effects includes menstrual irregularities. http://preview.tinyurl.com/clonazepram And Budeprion also has the same complaints. http://www.drugs.com/sfx/budeprion-side-effects.html read moreA week late and still no period? (5 Answers)There are so many reasons you can miss a period other than just pregnancy. I noticed in one of the comments you noted you have several children already, so you ... read moreLife Insurance. Which companies offer the shortest period between signing up and being insured. It is possible to do the process online? (2 Answers)My husband and I were just looking at buying life insurance. *Are you looking for term life insurance or whole life insurance? We compared rates at: http://www.intelliquote.com Then we filled ... read moreMy period is 6 days late. Could I be pregnant? (2 Answers)Yes, you could be. If you're always regular like clockwork, some of the tests out there can be used the day after a missed period. There are other reasons you ... read more
Ask a Question about Geological Periods 140 characters
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Geological Periods: Proterozoic Eon
- Palaeos: Proterozoic Eon (2500-600 MYA)
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Geological Periods: Paleoproterozoic Era
- Wikipedia: Paleoproterozoic Era
- Wikipedia: Siderian Period | Rhyacian Period
- Wikipedia: Orosirian Period | Statherian Period
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Geological Periods: Mesoproterozoic Era
- Palaeos: Mesoproterozoic Era
- Wikipedia: Calymmian Period | Ectasian Period | Stenian Period
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Geological Periods: Neoproterozoic Era
- Wikipedia: Neoproterozoic Era
- Wikipedia: Tonian Period | Ediacaran Period
- Palaeos: Cryogenian Period
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Geological Periods: Phanerozoic Eon
- Palaeos: Phanerozoic Eon (600-230 MYA)
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Geological Periods: Paleozoic Era
- Palaeos: Paleozoic Era
- Wikipedia: Permian Period
- Palaeos: Carboniferous Period | Devonian Period
- Wikipedia: Silurian Period
- Palaeos: Ordovician Period
- Wikipedia: Cambrian Period
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Geological Periods: Mesozoic Era
- University of California Museum of Paleontology: Mesozoic Era (230-63 MYA)
- Palaeos: The Triassic Period | The Jurassic Period
- Wikipedia: Cretaceous Period
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Geological Periods: Cenozoic Era
- Paleos: Cenozoic Era (63-5 MYA)
- Wikipedia: Tertiary Period
- Quaternary Research Association: Quaternary Period
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Geological Periods Books and Merchandise
- Amazon.com: Geological Periods: Books
- Google Product Search: Geological Periods Merchandise
- Barnes & Noble: Geological Time Periods Books
- Amazon.com: A Geologic Time Scale 1989
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