juvenissun
... and God saw that it was good.
- Apr 5, 2007
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A good index fossil should have a wide-spread distribution, yes. Maybe not global. And yes, if it is widespread that would make its extinction less likely. That is why there are so few index fossils species, relative to the total number of fossil species.
Why? We are talking about species here, not genera or higher taxa.
??? --> B --> ???, then B could be an index fossil.
A --> B --> C, then B would not be an index fossil.
Yes, A, B, and C are species.
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