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

Geologic Time Scale

Here's what you'll be making…

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

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.

Geologic Time ScaleMr. Cruz

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.

Geologic Time ScaleMr. Cruz

12.5 cm

14 cm

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

Geologic Time ScaleMr. Cruz

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.

Geologic Time ScaleMr. Cruz

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.

Geologic Time ScaleMr. Cruz

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.

Geologic Time ScaleMr. Cruz

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

Geologic Time ScaleMr. Cruz

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

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 cada línea y la etiqueta con los siguientes títulos: Precámbrico Las tres épocas Era Paleozoica Era Mesozoica Era Cenozoica

Geologic Time ScaleMr. Cruz

Pre

cam

bri

anThe

thre

e E

ras

Pale

ozoi

c E

ra

Mes

ozoi

c E

ra

Cen

ozoi

c E

ra

Precambrian Time

Precambrian Time

The 3 Eras (Phanerozoic

Eon)4.6 bya

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

The 3 Eras (Phanerozoic Eon)

Paleozoic EraMesozoic

EraCenozoic

Era

Explosion of life Age of the dinosaurs Rise of the mammals

544 mya

245 mya

66.4 mya P

rese

nt

Paleozoic Era

544 mya

505mya

438mya

408mya

360mya

286mya

245mya

Cambrian Ordovician Silurian Devonian Carboniferous Permian

• 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

Mesozoic Era

245mya

208mya

144mya

66.4 mya

Triassic Jurassic Cretaceous

• 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

Cenozoic Era

Tertiary Qua

rter

nary

66.4mya

Pre

sent1.6

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!