Upper Miocene to Pliocene strata in north Westland and Marlborough districts, New Zealand, contain abundant fossils representing a bioseries of planktonic foraminifera showing gradual progressive morphological changes. The bioseries commenced with Globorotalia miozea Finlay and ended with Globorotalia crassaformis (Galloway and Wissler). The form representing one stage of the bioseries in Marlborough differs slightly from the corresponding form in north Westland, 150 miles to the southwest, but the end form is the same in both areas.

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