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Earth's History

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Across
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Dating that tells the specific age of a fossil
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The first period of the Mesozoic Era
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Organisms of a the same group that can produce offspring
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Fossil remains that include footprints and inform us about how organisms lived
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____ time scale
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The middle stage of the Phanerozoic Eon - includes the dinosaur age
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Preserved remains of living things
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Era that comes before the Paleozoic
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Dating that uses information to determine if something is younger or older
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A species that is in danger of becoming extinct
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One of the earliest fossils found of life on earth
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Smaller block of time than Era - includes Jurassic
Down
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The middle of the Mesozoic period that was the "heyday" of the dinosaurs
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The largest block of geologic time
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Includes the Paleozoic, Mesozoic and Cenozoic
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The first stage of the Phanerozoic Eon - "ancient"
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When a species is no longer living on earth
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The last stage of the Phanerozoic Eon - goes to the present
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Type of fossil that helps identify a specific time period
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The center layer of the earth
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The outermost layer of the earth
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Earth's history traced to 4.5 ____ years ago.