| 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 |