Unit 6, Topic 1: Ancestry and Diversity Vocabulary

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index fossil

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fossils of organisms known to have existed during a particular time period

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fossil

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remains of a plant or animal preserved in Earth's crust

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fossil record

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the information about Earth's history that can be gathered from fossils

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rock record

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the history of the Earth's past recorded in the layers of rocks

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Precambrian time

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the earliest eon of Earth's history

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Paleozoic era

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a major interval of geologic time when primitive life was abundant

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Mesozoic era

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the second of Earth's major eras characterized by the presence of dinosaurs

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Cenozoic era

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the present era noteworthy for the rise of mammals

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epoch

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a subdivision of a period characterized by distinctive fossils and rock formations

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era

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a larger division of geologic time made up of multiple periods