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

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

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. Geologic Time Scale Mr. Cruz

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. Geologic Time Scale Mr. Cruz 12.5 cm 14 cm

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 Geologic Time Scale Mr. Cruz

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. Geologic Time Scale Mr. Cruz

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. Geologic Time Scale Mr. Cruz

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. Geologic Time Scale Mr. Cruz

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 cm 2) 100 millones años = 3 cm 3) 100 millones de años = 5 cm 4) 100 millones de años = 5 cm 5) 100 millones de años = 5 cm Geologic Time Scale Mr. Cruz 1. 1 billion years = 3cm million years = 3cm million years = 5cm million years = 5cm million years = 5cm

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 cada línea y la etiqueta con los siguientes títulos: Precámbrico Las tres épocas Era Paleozoica Era Mesozoica Era Cenozoica Geologic Time Scale Mr. Cruz Precambrian The three Eras Paleozoic Era Mesozoic Era Cenozoic Era

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

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

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

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

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 Mr. Cruz is born – the people rejoice!