Index Fossil

What makes a good index fossil ? 
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Geological Time

 What was used to help establish geological time? 

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What we have learned so far.

 We have been working on Evolution for the past few weeks. Today just post a comment about something you now know about evolution. 

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The same on the inside.

 A porpoise flipper, a bat wing, a frog arm and a human arm, have structures inside that are similar.

These parts that are similar in structure and origin are known as what? 
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We all have things in common

 A tail, gills, or gill slits are found in fish, reptiles, birds, and mammals. At what stage in life do these organisms have these traits in common? 

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Fossils are evidence evolution.

 There are many types of fossils, these are all clues for evolution. Please leave a comment naming one of these types of fossils.  

Clues for Evolution

 Evolution has evidence that supports the theory. What are some of the clues that support the theory of evolution? Please comment with one example of clue for evolution.