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GTS (update your ToC ) Geologic Time Scale : How is the GTS organized? PowerPoint PPT Presentation


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GTS (update your ToC ) Geologic Time Scale : How is the GTS organized? grouped by changes in global biotic turnover (many changes in flora/fauna species across the world in a relatively short time span) b. What are the units used to organize these events?

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GTS (update your ToC ) Geologic Time Scale : How is the GTS organized?

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Gts update your toc geologic time scale how is the gts organized

  • GTS (update your ToC)

  • Geologic Time Scale:

    • How is the GTS organized?

    • grouped by changes in global biotic turnover (many changes in flora/fauna species across the world in a relatively short time span)

    • b. What are the units used to organize these events?

    • Eon  Era  Period  Epoch

    • c. Is the GTS “scaled” mathematically? Explain.

    • No. New divisions are based on geologic and biotic changes on earth, NOT based on equal intervals of time.

    • d. What appears to be the major emphasis on the GTS?

    • changes in fauna in the very recent history (latest 1/2 Billion years)


Gts update your toc geologic time scale how is the gts organized

  • GTS (cont)

  • Geologic Time Scale:

    • e. Why are new divisions in time made?

    • climate change, appearance of fossils of new type of family, disappearance of many families or species/mass extinction events

    • f. What patterns can you find?

    • * Greater diversity closer to “today”

    • * species appears, species disappear – “extinction happens”

    • * flora and fauna start in the water and later show up on the land

    • * life-forms generally become physically more sophisticated


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