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Geologic Time Scale

Geologic Time Scale. Mr. Skirbst Earth Science Topic 25. Geologic Time Scale. Geologic Time Scale. Describing and dividing major events of Earth’s history. Geologic Time Scale. Era - longest division of geologic time. Geologic Time Scale. Era - longest division of geologic time

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Geologic Time Scale

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  1. Geologic Time Scale Mr. Skirbst Earth Science Topic 25

  2. Geologic Time Scale

  3. Geologic Time Scale Describing and dividing major events of Earth’s history

  4. Geologic Time Scale Era - longest division of geologic time

  5. Geologic Time Scale Era - longest division of geologic time 4 Major Eras

  6. Geologic Time Scale Era - longest division of geologic time 4 Major Eras Period – sub-divisions of eras

  7. Geologic Time Scale • Precambrian - early Earth

  8. Geologic Time Scale • Precambrian • Paleozoic “old life”

  9. Geologic Time Scale • Precambrian • Paleozoic • Mesozoic “middle life”

  10. Geologic Time Scale • Precambrian • Paleozoic • Mesozoic • Cenozoic “current life”

  11. Precambrian Era 4.6 bya – 570 mya

  12. Precambrian Era 4.6 bya – 570 mya Earth formed

  13. Precambrian Era 4.6 bya – 570 mya Earth formed Seas and mountains formed

  14. Precambrian Era 4.6 bya – 570 mya Earth formed Seas and mountains formed Simple life-forms in sea

  15. Precambrian Era 4.6 bya – 570 mya Earth formed Seas and mountains formed Simple life-forms in sea Oxygen builds up in air

  16. Paleozoic Era 570 mya – 225 mya

  17. Paleozoic Era 570 mya – 225 mya Divided into 6 periods based on major events

  18. Paleozoic Era Cambrian – sea-dwelling inverts.

  19. Paleozoic Era Cambrian – sea-dwelling inverts. Ordovician – first fish appear

  20. Paleozoic Era Cambrian – sea-dwelling inverts. Ordovician – first fish appear Silurian – first land plants

  21. Paleozoic Era Cambrian – sea-dwelling inverts. Ordovician – first fish appear Silurian – first land plants Devonian – first amphib. + forests

  22. Paleozoic Era Cambrian – sea-dwelling inverts. Ordovician – first fish appear Silurian – first land plants Devonian – first amphib. + forests Carboniferous – swamps, ferns, insects, reptiles

  23. Paleozoic Era Cambrian – sea-dwelling inverts. Ordovician – first fish appear Silurian – first land plants Devonian – first amphib. + forests Carboniferous – swamps, ferns etc Permian – conifers, lots of reptiles

  24. Paleozoic Era Memory aid: “COSDCP” DC

  25. Paleozoic Era Memory aid: “COSDCP” “Come Over,” Said DCPig DC

  26. Mesozoic Era 225 mya – 65 mya

  27. Mesozoic Era 225 mya – 65 mya Triassic – 1st dinosaurs + mammals

  28. Mesozoic Era 225 mya – 65 mya Triassic – 1st dinosaurs + mammals Jurassic – 1st birds + big dinos

  29. Mesozoic Era 225 mya – 65 mya Triassic – 1st dinosaurs + mammals Jurassic – 1st birds + big dinos Cretaceous – 1st flowers + dinos die out

  30. Cenozoic Era 65 mya – Present Tertiary – mammals, present-day features

  31. Cenozoic Era 65 mya – Present Tertiary – mammals, present-day features Quaternary – humans, ice ages

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