Talk:Index fossil

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Here is a question i want to know.What makes index fossils useable as time markers in rocks?I have these four conclusions but i don't know which one is the answer,A.They are hard to find.

             B.They only lived for about 1 million years.
             C.They were alive for hundreds of millions of years.
             D.They were only found in one location.

I need to know which one is the answer,can you please help me?You can e-mail me at (EMAIL REMOVED) with the answer.Thanks for your time.

I'd suggest reading the article. It already explains pretty clearly how index fossils are used, and what constitutes a good index fossil (tip: abundant and so easy to find, but only existed for a short period of geological time). --Plumbago 10:11, 6 November 2006 (UTC)

Also, you probably don't want to include your email on a wikipedia page; it's a ripe target for spammers. Nimur 16:55, 7 November 2006 (UTC)