Geologic Time.

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Presentation transcript:

Geologic Time

Geologic History Determined by major characteristics in the Earth’s surface, climate, and types of organisms

Era: A unit of geologic time that contains two or more periods

Period: A unit of geologic time that is longer than an epoch, but shorter than an era

Epoch: A unit of geologic time that is longer than an age but shorter than a period

Eras & Periods

Eras, Periods, & Epochs

Age of the Earth 4.6 Billion Years Old

Precambrian Era: 4.6 Billion to 542 Million Years Ago 88% of the Earth’s History Very little is known because rock layers have been eroded and deformed by plate tectonics Period during which the atmosphere and as a result life originated

Paleozoic Era: 542 Million to 251 Million Years Ago Continents went from separate to Pangea during this time period Far richer in plant and animal life Vertebrates such as fish, reptiles, and amphibians developed 90% of marine and 70% of land life died at end of era

Mesozoic Era: 251 million years to 65.5 million years ago Continents begin to drift apart Age of Reptiles, including dinosaurs Mass extinction at end, possibly by an asteroid Flowering plants begin to develop

Cenozoic Era: 65.5 million years ago to Present Temperatures decreased Age of mammals Fossils of first humanoids began to develop

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