A Quantitative Nannofossil Range Chart

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Abstract
Taxa (64) of Late Cretaceous nannofossils from 10 cored wells on the Canadian Atlantic margin were used to erect a statistical zonation. The methods are based on the matrix F of relative frequencies by which stratigraphic events are observed to succeed one another in the wells. Four types of events were used: lowest occurrences, subbottom, subtops and highest occurrences, which were ordered in an optimum stratigraphic sequence. The relative position of the events in this sequence is an average of all the relative positions encountered. The sequence was used to construct a range chart that expresses the ranges between average tops and bottoms and average subtops and subbottoms. This chart and the zonation based on it compare favorably with subjective conventional ones in the literature; the subtop/subbottom concept improves biostratigraphic resolution.

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