Abstract
Abstract The Rai Sandstone contains a bivalve species allied to Aphanaia otamaensis Waterhouse, 1979 from the Waipahi Group of South Otago, and upper Takitimu Group of Southland, of Early Permian age. Previously the Rai specimens had been compared to Maitaia trechmanni Marwick of late Middle Permian age. ?Aphanaia cf. otamaensis, and gastropod ?Mourlonia impressa Waterhouse from the Croisilles Volcanics indicate that the Lee River Group as originally defined is of Early Permian age, older than the Maitai Group, of Middle and Late Permian age.
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