The stratigraphy of upper Paleocene and lower Eocene sediments in the North Sea region is highly complex, biostratigraphical correlations are difficult, and the fact that the Epoch boundaries were defined in this region has caused many problems. Jolley et al. (2002) argue that recent estimates of the numerical age of events occurring close to the Paleocene-Eocene boundary are incorrect, because sediments “between and equivalent to the oldest lavas contain an influx of a diagnostic pollen flora, an influx of the dinocyst Apectodinium, a benthic foraminiferal extinction, nannofossil zone NP9, and a carbon isotope excursion associated with the late Paleocene...

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