Geologic Time Scale

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

2. Here's what you'll be making…

3. Here's how you make it… • 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. • Coloque su papel en su mesa y doblar el borde izquierdo por 1 pulgada (2.5 cm) • Crease la solapa y luego abrirlo. 1 inch or2.5 cm

4. Here's how you make it… • At the top of your paper, write in the title, “Geologic Time Scale” • Write your name in the top right hand corner. • En la parte superior de su papel, escriba en el título, "Geologic Time Scale" • Escriba su nombre en la esquina superior derecha. Mr. Cruz Geologic Time Scale

5. Here's how you make it… • Starting 8 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. • A partir de 8 cm de la parte superior, trazar una línea horizontal desde el pliegue • La línea debe ser de 14 cm de largo. • Dibuje un pequeño guión en la marca de 12,5 cm. Mr. Cruz Geologic Time Scale 14 cm 12.5 cm

6. Here's how you make it… • Make another line 5 cm below your first line. This line will be 16 cm long. • Make dashes at 9 cm and 14.5 cm. • Hacer otra línea de 5 cm por debajo de su primera línea. Esta línea será de 16 cm de largo. • Hacer guiones a los 9 cm y 14,5 cm Mr. Cruz Geologic Time Scale

7. Here's how you make it… • Draw another line 5 cm below the last line. This line will be 15 cm long. • Draw dashes at 2, 5.5, 7, 9.5, and 13 cm. • Dibuje otra línea de 5 cm por debajo de la última línea.Esta línea será de 15 cm de largo. • Dibuja guiones a los 2, 5.5, 7, 9,5, y 13 cm. Mr. Cruz Geologic Time Scale

8. Here's how you make it… • Draw another line 5 cm below the last line. This line will be 9 cm long. • Draw dashes at 2 cm and 5 cm. • Dibuje otra línea de 5 cm por debajo de la última línea. Esta línea será de 9 cm de largo. • Dibuja los guiones de 2 cm y 5 cm. Mr. Cruz Geologic Time Scale

9. Here's how you make it… • Draw another line 5 cm below the last line. This line will be 3.5 cm long. • Make a dash at 3 cm. • Dibuje otra línea de 5 cm por debajo de la última línea. Esta línea será de 3,5 cm de largo. • Hacer un guión de 3 cm. Mr. Cruz Geologic Time Scale

10. Here's how you make it… • 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 • Número de cada línea y escribir la escala adecuada:1) 1 mil millones años = 3 cm2) 100 millones años = 3 cm3) 100 millones de años = 5 cm4) 100 millones de años = 5 cm5) 100 millones de años = 5 cm Mr. Cruz Geologic Time Scale 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

11. Here's how you make it… • Fold the tab and label each line with the following titles: • Precambrian • The Three Eras • Paleozoic Era • Mesozoic Era • Cenozoic Era • Doble la pestaña de cadalínea y la etiqueta con los siguientestítulos: • Precámbrico • Las tresépocas • Era Paleozoica • Era Mesozoica • Era Cenozoica Mr. Cruz Geologic Time Scale Precambrian The three Eras Paleozoic Era Mesozoic Era Cenozoic Era

12. Precambrian Time The 3 Eras (Phanerozoic Eon) 4.6 bya Precambrian Time 544 mya Present • 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. The 3 Eras (Phanerozoic Eon) Present 544 mya 245 mya 66.4 mya Mesozoic Era Cenozoic Era Paleozoic Era Explosion of life Age of the dinosaurs Rise of the mammals

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

15. Mesozoic Era Triassic Jurassic Cretaceous 245mya 208mya 144mya 66.4 mya • 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

16. Cenozoic Era Quarternary Tertiary 66.4mya 1.6mya Present • 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 • Mr. Cruz is born – the people rejoice!