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This project probably belongs in either
WP Geology or
WP Biology. Since I am not a specialist in either field, I will add this page to WP Geology and hope that an expert can categorize it appropriately.
Nimur17:09, 26 April 2007 (UTC)reply
The following discussion has been closed. Please do not modify it.
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). --
Plumbago10:11, 6 November 2006 (UTC)reply
Many of the taxa in the table are only local index fossils and certainly not worldwide. Therefore, the table is rather useless: no geographic area has been mentioned.--
Tom Meijer (
talk)
18:37, 13 July 2008 (UTC)reply
Besides, no remark has been made that the application of index fossils is a rather oldfashioned method in biostratigraphy. This should be added. --
Tom Meijer (
talk)
18:41, 13 July 2008 (UTC)reply
This is an important topic which has been treated in a shabby manner. It is important to invertebrate palaeontology, indications of climate change, chronostratigraphy, and to teaching field geology.
Macdonald-ross (
talk)
08:41, 18 April 2019 (UTC)reply
As said earlier, Index fossils, et. al. is an important concept, much better, if still incompletely, covered in the new redirect target.
The present list is at best misleading. If it is intended as a list of Index species, there are dozens in the Ammonites and Inoceramids of the second half of the Cretaceous alone. It may be safe to say (without actually taking the time to count) that there are hundreds in North America alone.