What type of fossils are of organisms that lived over a wide area for a fairly short period of time and are used to determine the age of the rock it is in?
- Correct Answer: index fossils
- reference fossils
- inventory fossils
- rate fossils
Explanation: Fossils are used to determine the ages of rock layers. Index fossils are the most useful for this. Index fossils are of organisms that lived over a wide area. They lived for a fairly short period of time. An index fossil allows a scientist to determine the age of the rock it is in.
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