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This is evident first of all by the fact that it is part of a date list which is broken into three parts: "geologic samples", "archaeological samples", and "fossil animals".
Clearly, Pennsylvanian coal would be listed as a geologic sample, but this sample of "coal" is listed as an archaeological sample. In the original reference the sample is described as "scattered coals in a loamy rock in deposits of a 26-m [river] terrace".
These low levels also make it conceivable that some of the detected carbon-14 is due to a ubiquitous carbon-14 background.Cosmic rays are continuously producing radiocarbon from nitrogen-14.