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pollen diagram
CATEGORY: technique
DEFINITION: A diagram produced after the analysis of the pollen from a column of peat or other soil. Pollen diagrams consist of a number of graphs, showing the fluctuations of different pollen types through a sediment or soil. The vertical axis of the diagram represents depth through the deposit and is therefore roughly related to time, as the deeper layers are the oldest. Each small graph represents the changing frequency of one pollen type, either as a percentage (proportional pollen counting) or as an absolute frequency (absolute pollen counting). It is often possible to split the diagram up into a number of pollen zones, each dominated by high frequencies of a particular pollen type or types.

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