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Triassic Period
Triassic Period, a division of geologic time that began about 240,000,000 years ago and lasted about 35,000,000 years.
GEOLOGIC TIME SCALE
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.
Stuff You Should Know
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Cenozoic EraCenozoic Era, the most recent great division of geological time, including the present. See more »
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Mesozoic Era
Mesozoic Era, one of the major divisions of geologic time. It is sometimes called the Age of Reptiles. See more »
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Miocene Epoch
Miocene Epoch, a geologic epoch that began about 23,000,000 years ago and lasted 17,000,000 years. See more »
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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 »
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Archeozoic Era
Archeozoic Era, a division of geologic time used by some geologists. The Archeozoic Era corresponds to early Pre-cambrian Time. See more »
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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 »
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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 »
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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 »
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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 »
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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 »
