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Index fossil

An index fossil is a fossil that is found in rocks of only one geologic period and is therefore used to assign a date to any rock that it is found in.

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East Farmingdale, New York

... of it is land and 0.1 km² (0.04 mi²) of it is water. The total area is 0.56% water. Demographics As of the census of 2000, there are 5,400 people, 1,693 ...