Time periods in evolution???

Started by bjord146
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bjord146

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Hi people,
someone mentioned that they received a question on the actual test dealing with determining the time period of an organism based on the type of rock the fossil was in or the date of the sample. Has anyone else seen anything like this?? I know there are the jurassic period, cretaceous period, cenezoic period, etc... but what specifics do I need to know?? Thanks