1. The entire history of the world as told to us by the dirty, filthy rocks

3. Lay your paper on your table and fold the left edge over by 1 inch (2.5 cm) Crease the flap and then open it up. 1 inch or2.5 cm

4. At the top of your paper, write in the title, “Geologic Time Scale” Write your name in the top right hand corner. Geologic Time Scale Your Name

5. Starting 5 cm from the top, draw a horizontal line from the crease The line should be 14 cm long. Draw a small dash at the 12.5 cm mark. Geologic Time Scale Your Name 12.5 cm 14 cm

6. Make another line 7 cm below your first line. This line will be 16 cm long. Make dashes at 9 cm and 14.5 cm. Geologic Time Scale Your Name

7. Draw another line 7 cm below the last line. This line will be 15 cm long. Draw dashes at 2, 5.5, 7, 9.5, and 13 cm. Geologic Time Scale Your Name

8. Draw another line 7 cm below the last line. This line will be 9 cm long. Draw dashes at 2 cm and 5 cm. Geologic Time Scale Your Name

9. Draw another line 7 cm below the last line. This line will be 3.5 cm long. Make a dash at 3 cm. Geologic Time Scale Your Name

10. Number each line and write the proper scale: 1) 1 billion years = 3 cm 2) 100 million years = 3 cm 3) 100 million years = 5 cm 4) 100 million years = 5 cm 5) 100 million years = 5 cm 1. 1 billion years = 3cm 2. 100 million years = 3cm 3. 100 million years = 5cm 4. 100 million years = 5cm 5. 100 million years = 5cm Geologic Time Scale Your Name

11. Fold the tab and label each line with the following titles: Precambrian Phanerozoic Eon Paleozoic Era Mesozoic Era Cenozoic Era Geologic Time Scale Your Name Precambrian Phanerozoic Eon Paleozoic Era Mesozoic Era Cenozoic Era

12. Precambrian Time The 3 Eras (Phanerozoic Eon) 4.6 bya 544 myaPresent 4.6 bya -- begins when Earth forms from gas and dust (we think) 4 bya – oceans form 2.5 bya – organisms begin photosynthesis, makes more oxygen in the atmosphere. Most organisms were bacteria, algae, or soft-bodied animals

13. Paleozoic Era Mesozoic Era Cenozoic Era Explosion of lifeAge of the dinosaursRise of the mammals 544 mya 245 mya 66.4 mya Present

14. 544 mya 505 mya 438 mya 408 mya 360 mya 286 mya 245 mya CambrianOrdovicianSilurianDevonianCarboniferousPermian Shallow seas cover much of the land Explosion of life in seas Invertebrates with shells appear Ice cap covers North America Early vertebrates – jawless fish – become common Coral reefs develop Land plants appear Insects & spiders appear Age of fishes begins First amphibians Forests grow in swampy areas Winged insects First true reptiles N. America & Europe are covered in swamps All continents come together to form one large continent called Pangaea Reptiles become dominant Mass extinction kills many marine invertebrates

16. 245 mya 208 mya 144 mya 66.4 mya TriassicJurassicCretaceous Age of Reptiles begins First dinosaurs appear First mammals appear Turtles & crocodiles appear Pangaea continues to break apart Sea levels rise in many parts of the world Largest dinosaurs thrive First birds appears First flying reptiles appear (pterosaurs) Widespread volcanic activity First flowering plants appear Tyrannosaurus Rex Mass extinction kills dinosaurs

18. Tertiary Quarternary 66.4 mya Present 1.6 mya Age of mammals begins Whales and dolphins appear Horses, elephants, bears, rodents, and primates appear Continents move into present locations. Human ancestors Thick glaciers advance in most of N. America & Europe, all of Antarctica, and parts of S. American and Asia. Giant mammals in N. America & Eurasia Ms. Schmidt is born – the people rejoice!