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A shellfish alive today in a lake within a limestone catchment, for instance, will yield a radiocarbon date which is excessively old.The reason for this anomaly is that the limestone, which is weathered and dissolved into bicarbonate, has no radioactive carbon.The effect has been suggested as providing dates in error for the eruption of Thera which has been linked to the demise of the Minoan civilisation in the Aegean.One modern plant growing near the emanations had an apparent age of 1390 yr.

Implicit in the Conventional Radiocarbon Age BP is the fact that it is not adjusted for this correction.The effect of this has been to almost double the amount of C14 activity in terrestrial carbon bearing materials (Taylor, 1987).De Vries (1958) was the first person to identify this 'Atom Bomb' effect.Radiocarbon discrepancies due to volcanic CO2 emissions are a popular source of ammunition for fundamentalist viewpoints keen to present evidence to show that the radiocarbon method is somehow fundamentally flawed.Since about 1890, the use of industrial and fossil fuels has resulted in large amounts of CO2 being emitted into the atmosphere.[A Conventional Radiocarbon Age or CRA, does not take into account specific differences between the activity of different carbon reservoirs.

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