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The formal definition of the Murihiku Supergroup is amended, and constituent groups within the supergroup are rationalised. The age of the Murihiku Supergroup is extended back with the inclusion of sequences of Late Permian age, but is restricted upwards with the proposal of the Waipa Supergroup. Topmost Murihiku Supergroup is basal Late Jurassic. The lithological content of the supergroup is broadened to include limestone. Groups recognised herein are defined or in most instances redefined. They are: Kuriwao, North Range, Taringatura, Diamond Peak, Ferndale, Mataura, and Richmond in the South Island, and Newcastle, Rengarenga, and Kirikiri in the North Island. Apotu and Huriwai groups previously accommodated within Murihiku Supergroup are now part of the Waipa Supergroup.

A single fossil element from Titiroa Stream, Southland, probably represents a partial clavicle of a roughly 2‐m‐long member of the Stereospondyli (Amphibia). The fossil is from shallow marine rocks of the Wairuna Peak Group (Murihiku Supergroup, Murihiku Terrane), and is probably of early Middle Triassic age (Etalian Stage). This is the first report of presumed stereospondyls from New Zealand.

New mapping on the Chatham Islands, coupled with many new fossil determinations, has significantly refined our understanding of stratigraphic relationships of the Cretaceous-Cenozoic rocks exposed there. The following units are recognisable: Waihere Bay Group (emended), Tupuangi Formation (redefined; 240-400 m; Late Albian-Santonian), Pitt Island Group (emended), Kahuitara Tuff ( 300 m; Campanian-Maastrichtian), unnamed Cretaceous sandstone (> 0.3 m; Late (?) Cretaceous), unnamed Haumurian limestone (fissure fills; Late Maastrichtian), Tioriori Group (emended), Takatika Grit (c. 6 m; Maastrichtian-Paleocene), Tutuiri Greensand ( 100 m; Late Paleocene-Early Eocene), Te Whanga Limestone (redefined; 40-60 m; Early Eocene-Early Oligocene), Matanginui Limestone Member (redefined; < 35 m; Early- Late Eocene), Te One Limes...