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Mesozoic time line

Thanks to Thom Holtz for the wonderful summary of dinosaur turnover and
Paul for the bolide impact data.  
How about expanding on this and see if a timeline of events can be
created.  Some other possible areas: major volcanic events, the breakup of
Pangaea, possible areas of origination and subsequent spread of dinosaur
groups, sea level influences, etc.
This could be fun especially if a lot of people can add to the timeline.

I guess the first thing we need is the geologic time scale.

---John Schneiderman <dino@cwis.unomaha.edu>