GP2 (entity_id = 285): Isotope samples at the base of the Holocene were corrected by adding 0.8 for  18O and 1.7 for  13C, in order to be compararable to the aragonite values.
Samples labeled as "Artificial age" were added in the age modelling process (in the original publication) to reduce age model uncertainties in the border areas, and do not contain any additional information. For more details  see the original publication.