Abstract
Abstract In eastern Wairarapa indurated sedimentary “basement” forms an almost continuous belt some 140 km long and 3–15 km wide, generally overlain unconformably by late Cenozoic strata or faulted against Late Cretaceous-Early Tertiary rocks. These “basement” rocks, previously considered to be Late Jurassic-Early Cretaceous (Torlesse Supergroup) or Early Cretaceous (Taitai-Clarence Series) are mostly Motuan (Albian; Clarence Series), but locally probably as old as Urutawan (Albian). No base to the sequence is known. Two major Early Cretaceous units are present. An older Pahaoa Group (new name; Urutawan-Motuan) consisting of highly deformed, indurated, poorly fossiliferous alternating sandstone and siltstone (Mangapokia Formation, new name) and minor matrix supported breccia-conglomerate (Stronvar Member, new unit) enclosing at different stratigaphic levels units of mostly featureless sandstone (Taipo Formation), and intruded by penecontemporaneous basic igneous rocks. The younger Mangapurupuru Group (eme...
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