Concept for adding radiocarbon data: "laboratory + sample No.: 14C year ± range BP"
laboratory: identifies the laboratory that tested the sample, and the sample ID (specific 3 letter abbreviation)
sample no.: ID given to each sample by laboratory
14C year: the laboratory's determination of the age of the sample, in radiocarbon years
range: the laboratory's estimate of the error in the age, at 1σ confidence
BP: "before present"