Abstract
Abstract The Rangitikei River valley, between Utiku and Mangaweka in eastern Wanganui Basin, contains a mid‐Pliocene (c. 3.5–2.5 Ma), c. 750 m thick, southward dipping (6–12°), cyclothemic marine succession. Eleven sedimentary cycles occur within the succession. The lower four sand‐dominated cycles are assigned to the Utiku Group (new), which includes three newly defined formations: Tarare, Kawhatau, and Manui. Each formation contains one or more unconformity‐bounded cyclothems, which comprise a lower silty sandstone unit and an overlying sandstone unit. We correlate the cyclothems with oxygen isotope stages MG8 to 103 defined for ODP Site 846. Discrete sandstone, silty sandstone, and siltstone units are assigned member status and correspond to systems tracts in terms of sequence stratigraphic nomenclature. The distribution of the three newly defined formations is presented on a new geological map of the region. The upper seven siltstone‐dominated cycles are assigned to the Paparangi Group, which in easte...
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