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In a paper published in this journal, and in five previous papers published elsewhere, Lillegraven and McKenna (2008) criticize the research of Nichols and Ott (1978) and Nichols and Flores (2006). They attempt to cast doubt on the validity of the palynomorph-based biozones (the "P- zone" system) applied in strata of Paleocene age throughout the Rocky Mountain region. Their conclusions are without merit.
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On the palynomorph-based biozones in paleogene strata of rocky mountain basins