Abstract
SummaryEvidence is presented from five sites that the decrease in the Tilia pollen frequency seen in many British pollen diagrams is caused by human activity in the woodlands rather than by a change in climate. Analysis of the pollen diagrams makes it probable that there was considerable local variation in the composition of these woodlands and in the nature of prehistoric man's influence on them. Radiocarbon dates show that a major decline in the Tilia pollen frequency has taken place at various times. This means that the VII/VIII zone boundary, as originally defined by changes in tree‐pollen frequencies, has little or no climatic significance and the difficulty that has been encountered in defining its exact position follows from the fact that human activity is a much more variable influence upon vegetation than a change in climate.
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