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Index fossils

Index fossils

fossils (or groups of fossils) which are used by geologists and paleontologists to help correlate different events or processes in different parts of the world which happened at the same time. Species which make good index fossils are able to tolerate a wide range of ecological conditions, are geographically widespread, common, easy to find, and evolutionarily short-lived (that is, they speciated and then quickly became extinct). In general, they are also planktonic and very small.

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Re: Evolution of sexual reproduction

... is about the fossil record and in particular what is known as index fossils. Did you mean what you said or am I reading too much into your statement.

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by jevg
Sun Sep 26, 2010 7:09 pm
Forum: Evolution
Topic: Evolution of sexual reproduction
Replies: 29
Views: 36309

Re: Bird-Dinosaur News

... middle of a football game. I agree, but both rely on interpretation. Fossils can't speak, neither can strata, only a paleontologist or a geologist. ... I have read creationist articles, such as this one: http://www.icr.org/index.php?module=res ... chp_sa_r01 These articles usually don't do anything ...

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by AFJ
Sat Jul 04, 2009 1:19 pm
Forum: Evolution
Topic: Bird-Dinosaur News
Replies: 46
Views: 59351

Global Crayfish Distribution and Interspecific Competition

... . Fossils discovered on an NSF-funded expedition in Antarctica last December ... .] Look also to http://www.crusta10.de/index.php?sideid=galerie&showid=M ; many of the species shown here ...

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by Shagreen
Fri Mar 25, 2005 12:56 am
Forum: Zoology Discussion
Topic: Global Crayfish Distribution and Interspecific Competition
Replies: 4
Views: 18054

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