Depending on the age of the marine carbonate, a to year correction i. Calcite that has recrystallized, and therefore a contaminant, is white and chalky and easily removed by drilling. This phenomenon, accompanied by the conversion of aragonite to calcite, also alters the carbon 14 ratio. It has been shown that powdered carbonates will absorb atmospheric CO2 due to the very large surface area. The most common contaminants of shell samples for radiocarbon dating are those that are caused by isotopic exchange and recrystallization.
In certain parts of the globe, the equatorial region in particular, deep waters move up.
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