Heterastridium(Hydrozoa) from Norian sequences inNew Caledonia and New Zealand

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Abstract
Globular bodies with vermicularly-sculptured surfaces and cellular internal structure, identified as the hydrozoan Heterastridium conglobatum Reuss, are found in late Triassic rocks of New Caledonia in a Monotis shellbed on l'Ile Hugon. Less wellpreserved specimens, identified as Heterastridium cf. conglobatum and Hererastridium sp., occur in rocks of the Richmond Group in Nelson and the Taringatura Group in Southland, New Zealand. These occurrences seem to demonstrate the presence of the Suessi Zone in New Caledonia and New Zealand Upper Norian sequences. Correlation of the New Zealand local stages late Otamitan and Warepan with the Suessi Zone suggests a Norian age for part, perhaps all, of the Halobia zone in New Zealand.

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