Abstract
Abstract Buchia plicata occurs in the uppermost levels of the Puaroan stage, but was used by Marwick to define the base of the Puaroan. Modern research has thrown doubt on the basal Puaroan occurrences of B. plicata and indicated a need for redefinition of the Puaroan stage. Benthic fossils are sparsely distributed adjacent to the Ohauan-Puaroan boundary and the remains of non benthic forms, in particular belemnites, offer the greatest promise of providing a faunal basis for the boundary. Fossil1 collections from topmost Ohauan and basal Puaroan strata indicate that a homotaxial faunal succession of belemnite guards is present in several sections in south-west Auckland. The belemnite Hibolithes arkelli grantmackiei Challinor appears consistently near the base of most sections and is an appropriate fossil with which to define the base of the Puaroan Stage. Faunal correlation between Puaroan sections at Kawhia Harbour and Port Waikato can now be made with reasonable confidence and stratigraphic continuity b...
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