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10 Cards in this Set
- Front
- Back
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Geologic Time Scale
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Geological Time Scale is used to describe the timing and relationships between events that have occurred throughout Earth's history.
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Trilobites
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fossil group of extinct marine arthropods that form the class Trilobita.
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Eon
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The longest subdivision
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Periods
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Units of geologic time characterized by the types of existing worldwide at a time.
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Epochs
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Smaller units of time.
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organic evolution
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Species that changed over geologic time.
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species
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A group of organisms that normally only reproduce with other members of it's group.
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Natural Selection
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Organisms with characteristics that are suited to a certain environment.
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Pangaea
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Continents form to one giant land mass.
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Era
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The next longest subdivision.
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