Geologic Timeline 

Scale

10 cm = 1 billion years

1 cm = 100 million years

.1cm = 1 mm = 10 million years

.1 mm - 1 million years

.01mm = 100,000 years 

 

Geologic Timeline

1.Use a metric ruler to mark 10 cm sections on a strip of paper that is about 50 cm long.

2.Label each 10 cm section in order from top to bottom as follows: 1bya(billion years ago), 2 bya, etc.  The Earth’s timeline begins at 4.6 bya.

3.Divide each 10 cm section into 10 equal subsections.  Divide the top 1 cm into 10 subsections.  Calculate the number of years that are represented by 1 mm on this scale.

4.On yours timeline, label the following events:

1.Earth forms – 4.6 billion years ago

2.Cyanobacteria  form – 3 billion years ago

3.Eukaryotes form – 2 billion years ago

4.Paleozoic Era begins – 543 million years ago

5.Life comes on land – 345 million years ago

6.Largest mass extinction ends the Paleozoic Era/ Mesozoic Era begins – 248 million years ago

7.Dinosaurs rule – 206 million years ago

8. Flowering plants appear – 144 million years ago

9. Mesozoic Era ends/ Cenozoic Era begins – 65 million years ago

·     10. Earliest hominids – 7 million years ago

·     11. Homo habilis – 2 million years ago

·     12. Homo erectus – 1 million years ago

13. Neanderthals – 400,000 years ago

14. Homo sapiens – 100,000 years ago

 

 

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