Precambrian: Oldest era, Longest era, Era with no periods, First life, All life was in the ocean, Least is known about this era, Paleozoic: Second oldest era, Life moved to land here, First plants, First reptiles, First amphibians, Has the most periods, Largest mass extinction ends this era, Some periods in it: Cambrian, Devonian, Silurian, Pennsylvanian.., Mesozoic: Third oldest era, First mammals, First dinosaurs, First birds, Periods are Triassic, Jurassic, and Cretaceous, Ended when dinosaurs went extinct, Crater from asteroid impact dates to this era (65 mya), Cenozoic: Current era, Mammals began to flourish and take over., First humans, Civilizations evolved, Last ice age ended, Quaternary and Tertiary are the only periods so far, Humans are the dominant species,
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Geologic Era review
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Difabiocms
G7
G8
G9
Geology
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