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

3. Geologic Time Scale

4. Describing and dividing major events of Earths history

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

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

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

8. Geologic Time Scale 1.Precambrian - early Earth

9. Geologic Time Scale 1.Precambrian 2.Paleozoic old life

10. Geologic Time Scale 1.Precambrian 2.Paleozoic 3.Mesozoic middle life

11. Geologic Time Scale 1.Precambrian 2.Paleozoic 3.Mesozoic 4.Cenozoic current life

12. Precambrian Era 4.6 bya – 570 mya

13. Precambrian Era 4.6 bya – 570 mya Earth formed

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

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

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

17. Paleozoic Era 570 mya – 225 mya

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

19. Paleozoic Era Cambrian – sea-dwelling inverts.

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

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

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

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

24. 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

25. Paleozoic Era Memory aid: COSDCP

26. Paleozoic Era Memory aid: COSDCP Come Over, Said DC Pig

27. Mesozoic Era 225 mya – 65 mya

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

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

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

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

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