The discovery of a fossil's age can be determined through methods involving radiometric dating. Fossils must then be compared to other organisms of that time period to determine changes to it.
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Yes, the age of a fossil can provide information about the timing of organism changes through the geologic time scale. By examining fossils from different time periods, scientists can track the evolution of organisms over time and understand how they have changed and adapted to their environments.
The absolute age of the index fossil was determine by radioactive dating or another absolute method
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A fossil type characterized by an open space left inside a rock by an organism that has decayed is called a mold fossil. Mold fossils are created when the organism decomposes and the impression is preserved in the sediment that surrounds it, leaving behind a cavity in the shape of the organism.