geologic time scale library
The geologic time scale provides evidence of some of the major events that have helped to shape our planet. Here you can learn all about the geologic time scale.
Featured Article: Permian Period
Permian Period, the geologic period that began about 280,000,000 years ago and lasted 55,000,000 years. See more »
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Articles 1-20 of 26
Archeozoic Era
Archeozoic Era, a division of geologic time used by some geologists. The Archeozoic Era corresponds to early Pre-cambrian Time.
See more »Cambrian Period
Cambrian Period, the first geologic period of the Paleozoic Era. It began 570,000,000 years ago and lasted 70,000,000 years.
See more »Cenozoic Era
Cenozoic Era, the most recent great division of geological time, including the present.
See more »Cretaceous Period
Cretaceous Period, a division of geologic time that began about 140,000,000 years ago and lasted about 65,000,000 years.
See more »Devonian Period
Devonian Period, a division of geologic time. It began about 395,000,000 years ago and lasted about 35,000,000 years.
See more »Eocene Epoch
Eocene Epoch, a division of geologic time that began about 54,000,000 years ago and lasted about 17,000,000 years.
See more »Epoch (Geology)
Epoch, in geology, a subdivision of geologic time. Geologists divide the earth's history into eras, which are subdivided into periods.
See more »Jurassic Period
Jurassic Period, the geologic name given to the middle period of the Mesozoic Era, between the Triassic and the Cretaceous periods.
See more »Mesozoic Era
Mesozoic Era, one of the major divisions of geologic time. It is sometimes called the Age of Reptiles.
See more »Miocene Epoch
Miocene Epoch, a geologic epoch that began about 23,000,000 years ago and lasted 17,000,000 years.
See more »Neogene Period
Neogene Period, the name of the more recent of two periods (the other being the Paleogene Period) into which some geologists divide the Cenozoic Era.
See more »Oligocene Epoch
Oligocene, Epoch. A division of geologic time that began about 37,000,000 years ago and lasted 14,000,000 years.
See more »Ordovician Period
Ordovician Period, a division of geologic time that began about 500,000,000 years ago and lasted 70,000,000 years.
See more »Paleocene Epoch
Paleocene Epoch, the lowest (oldest) division of the Tertiary Period of geologic time.
See more »Paleogene Period
Paleogene Period, the name of the earlier (less recent) of two periods into which some geologists divide the Cenozoic Era.
See more »Paleozoic Era
Paleozoic Era, one of the major divisions of geologic time. It began 570,000,000 years ago and ended 240,000,000 years ago.
See more »Pennsylvanian Period
Pennsylvanian Period, the geologic period that began about 310,000,000 years ago and lasted 30,000,000 years.
See more »Permian Period
Permian Period, the geologic period that began about 280,000,000 years ago and lasted 55,000,000 years.
See more »Pliocene Epoch
Pliocene Epoch, the geologic epoch that began about 6,000,000 years ago and lasted about 4,000,000 years.
See more »Precambrian Time
Precambrian Time, a major division of geologic time. Precambrian time began approximately 4,600,000,000 years ago with the formation of the earth and ended about 570,000,000 years ago with the beginning of the Cambrian Period, the first period of the Paleozoic Era.
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