Written by: Stephen Pegler
Sunday, January 28, 2007

1.  What are the longest time periods in the Earth's history called?

2.  What is the name given to the longest time period in the Earth's history?

3.  What is a fossil?

4.  Which is more likely to form a fossil - an octopus or an oyster?  Why?

5.  Which is more likely to make a good index fossil
      a.  Organism 1 lived in South America for 5 million years
      b.  Organism 2 lived in Asia and Europe for only 2 million years

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