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- 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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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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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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Geological Periods Questions
Can CLONAZEPAM, and BUDEPRION Cause A Missed Period? 1 AnswerClonazepam side effects includes menstrual irregularities. http://preview.tinyurl.com/clonazepram And Budeprion also has the same complaints. http://www.drug... read more
A week late and still no period? 5 AnswersThere 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 more
Life Insurance. Which companies offer the shortest period between signing up and being insured. It is possible to do the process online? 2 AnswersMy 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://ww... read more
My period is 6 days late. Could I be pregnant? 2 AnswersYes, 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
view more questions...
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Geological Periods: Proterozoic Eon
- Palaeos: Proterozoic Eon (2500-600 MYA)
Geological Periods: Paleoproterozoic Era
- Wikipedia: Paleoproterozoic Era
- Wikipedia: Siderian Period | Rhyacian Period
- Wikipedia: Orosirian Period | Statherian Period
Geological Periods: Mesoproterozoic Era
- Palaeos: Mesoproterozoic Era
- Wikipedia: Calymmian Period | Ectasian Period | Stenian Period
Geological Periods: Neoproterozoic Era
- Wikipedia: Neoproterozoic Era
- Wikipedia: Tonian Period | Ediacaran Period
- Palaeos: Cryogenian Period
Geological Periods: Phanerozoic Eon
- Palaeos: Phanerozoic Eon (600-230 MYA)
Geological Periods: Paleozoic Era
- Palaeos: Paleozoic Era
- Wikipedia: Permian Period
- Palaeos: Carboniferous Period | Devonian Period
- Wikipedia: Silurian Period
- Palaeos: Ordovician Period
- Wikipedia: Cambrian Period
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
Geological Periods: Cenozoic Era
- Paleos: Cenozoic Era (63-5 MYA)
- Wikipedia: Tertiary Period
- Quaternary Research Association: Quaternary Period
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
- This page was created by Lindsayf, a Part Time Guide in the Mahalo Greenhouse (see the original), mentored by Marcand and curated by Lelah.
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@CarbonHeart Except that geological history clearly shows that it is cooling periods that tend to produce droughts
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