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Fossils most often form when a dead organism is buried in sediments.
The calico scallop is an index fossil. It is well documented to have lived 1.8 million years ago. Therefore, the approximate age of the rock in which this fossil is found is
Dinosaur footprints are original remains.
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What are index fossils used to determine?
All of the following conditions help preserve organisms as fossils EXCEPT ____.
To be a useful index fossil, a species must have been rare.
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