Please note that the 14C ages given in the abstract were in conventional years BP and not in calendar years.
The text should be :
The lower reddish clay and silt , with 14C ages from 13.8 to 12.94 cal. ka, represent the early phase of the Goldthwait Sea. The overlying glacial complex and a local moraine, with 14C ages from 12.92 to 12.6 cal. ka, corresponds to an Early Younger Dryas glacial readvance, correlated to the Saint-Narcisse Moraine.