1. History of Life on Earth Evolutionary TIMELINE Ms. Herrera

2. ► Earth is 4.6 billions years old ► 1 billion= 1000 million ► 1 trillion= 1000 billion ► How many millions of years old is earth? ► 4600 million years

3. PrecambrianPaleozoicMesozoicCenozoic

4. PrecambrianPaleozoicMesozoicCenozoic 4.6 bya Earth Forms 2.2 bya 1 st oxygen producing bacteria First multicellular organisms 544 mya Mass Extinction

5. PrecambrianPaleozoicMesozoicCenozoic 4.6 bya Earth Forms 2.2 bya 1 st oxygen producing bacteria 544 mya Mass Extinction 500 mya 1 st fish-”armored fish” 410 mya 1 st amphibians invade land 440 mya 1 st squid 400 mya 1 st sharks & Small reptiles 245 mya Mass Extinction

6. PrecambrianPaleozoicMesozoicCenozoic 4.6 bya Earth Forms 2.2 bya 1 st oxygen producing bacteria 544 mya Mass Extinction 500 mya 1 st fish-”armored fish” 440 mya 1 st squid 410 mya 1 st amphibians invade land 400 mya 1 st sharks & Small reptiles 245 mya Mass Extinction T - J - C Dinosaurs Dominate Flowering Plants evolve 65 mya Mass Extinction

7. PrecambrianPaleozoicMesozoicCenozoic 4.6 bya Earth Forms 2.2 bya 1 st oxygen producing bacteria First multicellular organisms 544 mya Mass Extinction 500 mya 1 st fish-”armored fish” 410 mya 1 st amphibians invade land 440 mya 1 st squid 400 mya 1 st sharks & Small reptiles 245 mya Mass Extinction T - J - C Dinosaurs Dominate Flowering Plants evolve 65 mya Mass Extinction 64 mya Mammals, Birds and insects started to “radiate” and fill niches: 1 mya 1 st hominids 200,000 ya 1 st humans

8. Directions ► For each ERA, create drawings that represent the animals featured during that time. ► Take your time to draw out animals, plants or bacteria. ► Use the book (pages 427 – 440) for samples of pictures.

9. Vocabulary Extinct- When a species dies out.

10. Paleontologist- scientists that study fossils.

11. ► Fossil - the preserved or mineralized remains or imprint of an organism that lived long ago

12. How do fossils form? ► 1. Death

13. 2. Decay and burial

14. 3. Sediment accumulation and mineralization

15. 4. Uplift and exposure

16. 5. Discovery and extraction

17. Fossil samples

18. Relative dating: ► determining the age of a fossil by comparing its placement with that of fossils in other layers of rock. Top layers are younger than bottom layers this also applies to the fossils found within that layer

20. Half-life radioactive dating Some of the elements found in rocks are radioactive. Radioactive elements decay at a steady rate. A half life is the time required for half of the radioactive atoms in a sample to decay. Age of a sample can be calculated based on the remaining atoms.

21. Fossil Record- Provides evidence about the history of life on earth.