| Key | Notes |
|---|---|
| a | uncertainty in ΔR does not include error in calibration curve |
| b | Inclusion in regional averages not advisable |
| c | location is approximate |
| d | radiocarbon age calculated from published Δ14C, D14C, or δ14C values |
| e | radiocarbon age calculated from published Δ14C, δ14C, or pM values after removal of age correction |
| f | radiocarbon age calculated from published Δ14C or δ14C values after removal of age correction and fossil fuel correction |
| g(n) | Exact year of death unknown. n=estimate of uncertainty in year of death, if available. |
| g(<) | Exact year of death unknown. Sample collected prior to year given by unknown number of years |
| midpoint(n) | For multiple samples of coral rings, n= number of years on either side of the midpoint. The radiocarbon age and error given is the weighted mean and standard deviation of the measurements. |
| h | Computation is based on the model mixed layer radiocarbon age calculated for AD 1950 |
| j | radiocarbon age and error corrected for isotope fractionation with estimated δ13C and uncertainty |
| k | radiocarbon age normalized for isotope fractionation to δ13C = -25 per mil PDB instead of to 0 per mil as originally published |
| l | radiocarbon age calculated from percent modern after removal of decay from time of growth to 1950 in non-conventional percent modern and normalized for isotope fractionation to δ13C = -25 per mil PDB instead of to 0 per mil as originally published |
| m | meters of water depth |