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GEOLOGIC TIME

TermDefinition
What is another name for the Precambrian Eon? Before Life
What is another name for the Paleozoic Era? Old Life
What is another name for the Mesozoic Era? Age of the Reptiles
What is another name for the Cenozoic Era? Age of the Mammals
How long ago was the Precambrian Eon? 4.6 billion to 543 million years ago
How long ago was the Paleozoic Era? 543 million to 248 million years ago
How long ago was the Mesozoic Era? 258 million years ago
What is the Cenozoic Era? The era we are currently living in
How long ago was the Cenozoic Era? 65 million years ago
When did man first appear? 500,000 years ago
What is the largest division of geologic time? Eon
What is the second largest division of geologic time? Era
What is the third largest division of geologic time? Period
What is the smallest division of geologic time? Epoch
What type of animals flourished in the Paleozoic Era? Marine
How did the Paleozoic Era end? With a mass extinction the nearly killed 90% of all species
What happened at the end of the Mesozoic Era? 15% to 20% of the species became extinct
What types of animals lived at the end of the Mesozoic Era? Dinosaurs, small mammals, and birds
What types of animals lived at the end of the Paleozoic Era? Amphibians, reptiles, and insects
What period are we in right now? Quaternary
Created by: littleduck14
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