Calendrical dating definition

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Many new techniques are being developed and tested.

CATEGORY: technique DEFINITION: Borings taken from the Arctic and Antarctic polar ice caps, containing layers of compacted ice, useful for the reconstruction of paleoenvironments and paleoclimatology and as a method of .

Continuous cores, sometimes taken to the bedrock below, allow the sampling of an ice sheet through its entire history of accumulation.

Because there is no melting, the layered structure of the ice preserves a continuous record of snow accumulation and chemistry, air temperature and chemistry, and fallout from volcanic, terrestrial, marine, cosmic, and man-made sources.

This method yields an absolute date within about 50 years."CATEGORY: technique DEFINITION: Any of a serious of methods of analyzing bone samples, especially by measuring fluorine, uranium, nitrogen -- also called the FUN technique -- or by using stratigraphy.

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