Summary Plant microfossil samples from drillholes near Frankton, through some 700 ft of pumiceous and non‐pumiceous sand, silt, clay and lignitic beds, range in age from Waitotaran (Upper Pliocene) to Upper Pleistocene or younger. The Plio‐Pleistocene (Waitotaran‐Nukumaruan) boundary is clearly shown where a sub‐tropical Waitotaran vegetation is replaced by a Lower Nukumaruan vegetation, indicating a climate cooler than that of the present day. A brief comparison is made with similar Plio‐Pleistocene sequences elsewhere in New Zealand.
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Couper et al. (1960) studied this question.
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