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Most pollen dates disagree with 14C dates based on macrofossils or carbonates, with age differences typically exceeding 250 yr and reaching 4000 yr in one instance. Significant proportions of reworked pollen grains in ocean and wetland samples are associated with pollen dates that are too old.
The pollen is extracted and then concentrated and stained and examined under a microscope.
Pollen samples from 3 tidal wetlands were taken from levels dated with 137Cs and 210Pb profiles.
Pollen dates from 2 additional wetlands were compared with 14C dates of botanical macrofossils.
Absolute dating methods are used to determine an actual date in years for the age of an object.
Before the advent of absolute dating methods in the twentieth century, nearly all dating was relative.
Pollen extracted from ocean and wetland sediments cored from the eastern Canadian Margin, James Bay region, and Atlantic provinces of Canada have been radiocarbon dated and results are reported here.