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The deeper layers are older than the layers found at the top, which aids in determining the relative age of fossils found within the strata. Such index fossils must be distinctive, globally distributed, and occupy a short time range to be useful.

* Correspondence to be sent to: Department of Biodiversity Informatics, Swedish Museum of Natural History, Box 50007, SE-10405 Stockholm, Sweden; E-mail: [email protected]

Scientists find the ratio of parent isotope to daughter isotope.

Love-hungry teenagers and archaeologists agree: dating is hard.

Two samples for which C control indicated the dates were not meaningful.

In general, both bones and tooth enamels gave ages too young, although some were clearly too old.

This process continues over time, with the organism losing half of the remaining C-14 isotopes each 5,730 years.

Fossils are collected along with rocks that occur from the same strata.

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Carbon-14, or radiocarbon, is a naturally occurring radioactive isotope that forms when cosmic rays in the upper atmosphere strike nitrogen molecules, which then oxidize to become carbon dioxide.The parent isotope is the original unstable isotope, and daughter isotopes are the stable product of the decay. In the first 5,730 years, the organism will lose half of its C-14 isotopes.Half-life is the amount of time it takes for half of the parent isotopes to decay. In another 5,730 years, the organism will lose another half of the remaining C-14 isotopes.A series of well preserved mammal bones and horse teeth was analyzed from archaeological levels of Tournal Cave (Magdalenian, Aurignacian, and Mousterain) to test the hypothesis that well-crystallized enamel behaves more as a closed system than does whole bone.The isotopic composition of bones and tooth enamels from this deposit meet criteria for confidence, and gave no reasons to suspect contamination or open-system behavior.

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