The rate of decay of this unstable isotope after the organism has died is assumed to be constant, and is measured in half-lives of 5730 40 years, meaning that the amount of carbon-14 is reduced to half the amount after about 5730 years.
The word palynology comes from the Greek word "palunein" meaning to sprinkle or scatter, and the Latin "pollen" meaning flour or dust.
Pollen grains are produced by seed plants (Spermatophytes); spores are produced by seedless plants, mosses, club mosses, and ferns.
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artefacts discovered in close proximity within the same context, or architectural features thought to have been standing at the same time.