New fossil localities in the Maitai Group, Nelson, and comments on its age

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Abstract
The ammonoids ?Episagiceras aff. noetlingi Haniel and Duvilleoceras woodmani Waterhouse, previously known only from the Greville Formation (Maitai Group) of D'Urville Island, are recorded from boulders of Greville-Jike lithology in the Maitai and Wairoa Rivers, eastern Nelson. Although stratigraphic evidence favours retention of the formation in the Maitai Group its age is uncertain. According to W. M. Furnish and colleagues the Greville ammonoids indicate an Early Triassic age but]. B. Waterhouse maintains that brachiopods in the upper part of the Maitai Group (Stephens Formation) have Permian affinities. Until independent evidence is obtained (such as that from conodont zonation), and the world Permian-Triassic boundary satisfactorily defined, it is not possible to assign a definite age to the Greville Formation, although a Permian age appears likely.

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