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| record of events in Earth's history based on major evolutionary changes and geological events |
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| major subdivision of the geologic time scale based on differences in life-forms |
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| next-smaller division of the geologic time scale after era |
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| division of geologic time smaller than a period |
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| an organism that lived hundreds of millions of years ago and is considered an index fossil of the Paleozoic era |
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| longest geologic time unit in Earth's history |
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| one of the earliest life-forms on Earth |
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| geologic era marked by the first appearance of life-forms with hard parts |
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| animals that live on land and breathe air but return to water to reproduce |
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| egg-laying, scaly skinned animals that do not need to return to water to reproduce and probably evolved from the same ancestor as amphibians |
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| geologic era in which Pangeae broke up, the present-day continents were formed, and whose dominant land life-forms were reptiles and gymnosperms |
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| stones swallowed by dinosaurs and by modern birds to help with digestion |
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| geologic era in which we live |
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