The interglacial peat deposit at Benburb is sealed by glacigenic diamict. It is the only interglacial peat deposit presently known in Northern Ireland. The peaty sequence at Benburb is sealed by a drumlin forming till and therefore predates the last cold stage.
Floristically its pollen content is similar to about ten other interglacial sites in Ireland which are thought to belong to the Gortian temperate stage. The Gortian interglacial dates from some 300-420,000 years before present (B.P.) and is generally assumed to predate the penultimate, Munsterian, glaciation.
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