A pollen diagram and macrofossils from Kettlehole Bog Cass, South Island, New Zealand

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Abstract
A long pollen diagram and a rich flora of macrofossils from a mire at Cass are used to interpret the vegetation changes and environmental changes since the end of the last large advance of the Waimakariri Glacier. The trend of the sequence is similar to those described by other workers for the same area, for Westland, and for Southland and Otago. It is proposed that the boundary between the cold Otiran glacial stage and the warm AranUlan stage should be placed where fossils and sediments indicate warming, i.e., at the transition from a Dacrydium Coprosma environment to a Phyllocladus environment. There is good evidence tor the existence of a wetter and milder climate than at present for part of the Aranuian period.

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