1. GEOLOGIC TIME SCALE

2. PRECAMBRIAN ERA  5,000 – 544 MYA.  The beginnings of life, approximately 1,200 MYA.  Single and multiple celled organisms- lived in water.  5,000 – 544 MYA.  The beginnings of life, approximately 1,200 MYA.  Single and multiple celled organisms- lived in water.

3. Cyanobacteria  prokaryote, no nucleus.

4. PALEOZOIC ERA  544 - 245 MYA.  The evolution of life in the sea and on land.  Divided into 7 Periods: Cambrian, Ordovician, Silurian, Devonian, Mississippian, Pennsylvanian, Permian.  544 - 245 MYA.  The evolution of life in the sea and on land.  Divided into 7 Periods: Cambrian, Ordovician, Silurian, Devonian, Mississippian, Pennsylvanian, Permian.

5. Cambrian period  544 – 505 MYA.

6. Cambrian period  Great variety of marine invertebrates.

7. Ordovician period  438 – 505 MYA.  First fish began to appear.  438 – 505 MYA.  First fish began to appear.

8. Silurian period  408 – 438 MYA.  First land plants form.  408 – 438 MYA.  First land plants form.

9. Coral  coral reefs & cephalopods abundant.

10. Devonian period  360 – 408 MYA.  First land dwelling creatures appear.  First amphibians.  360 – 408 MYA.  First land dwelling creatures appear.  First amphibians.

11. Devonian Ocean

12. Mississippian period  320 – 360 MYA.  Insects evolve.  First fully terrestrial creatures evolve.  320 – 360 MYA.  Insects evolve.  First fully terrestrial creatures evolve.

13. Pennsylvanian Period  286 – 320 MYA.  Reptiles evolve.  286 – 320 MYA.  Reptiles evolve.

14. Pennsylvanian Period  Swampy, future coal beds.

15. Permian period  245 – 286 MYA.  Largest mass extinctions. 90-95% marine invertebrates became extinct.  Reptiles getting bigger and stronger.  245 – 286 MYA.  Largest mass extinctions. 90-95% marine invertebrates became extinct.  Reptiles getting bigger and stronger.

16. MESOZOIC ERA  “Age of the Dinosaurs”  66 – 245 MYA.  Three periods: Cretaceous, Jurassic, Triassic.  “Age of the Dinosaurs”  66 – 245 MYA.  Three periods: Cretaceous, Jurassic, Triassic.

17. Triassic Period  208 – 245 MYA.  First mammals.  Reptiles ruled.  208 – 245 MYA.  First mammals.  Reptiles ruled.

18. Jurassic Period  144 – 208 MYA.

19. Jurassic Period  Dinosaurs dominant.

20. Jurassic Period  First birds begin to appear.

21. Cretaceous Period  66 – 144 MYA.  Last period of dinosaurs.  Largest dinosaurs.  66 – 144 MYA.  Last period of dinosaurs.  Largest dinosaurs.

22. CENOZOIC ERA  Began at the extinction of the dinosaurs.  Present to 66 MYA.  Rise of the mammal.  Began at the extinction of the dinosaurs.  Present to 66 MYA.  Rise of the mammal.

23. Tertiary Period  1.5 – 66 MYA.  Flowering plants dominate.  Mammals dominate.  1.5 – 66 MYA.  Flowering plants dominate.  Mammals dominate.

24. Tertiary Period

25. Quaternary Period  Present – 1.6 MYA.

26. Quaternary Period  Evolution of humans.

27. Human evolution

28. Extinctions and Variations