Late quaternary transgressive/regressive sequences from Taranaki continental shelf, western New Zealand

Phylogenetic relationships ofWainuia(Mollusca: Pulmonata)—biogeography and conservation implications

“…This very rough estimate is significantly different from the 11 000 years proposed by Te Punga (1953) when discussing the evidence for a Cook Strait land bridge and speciation rates in Wainuia. It is more consistent with the investigations by Lewis et al (1994) and Nodder (1995), who concluded that any faunal exchanges between the North and South Islands since the formation of Cook Strait c. 450 000 years ago were severely limited. Subsequent exchanges were possible only for brief periods ending finally c. 140 000 years ago.…”

Sedimentary architecture of a Plio-Pleistocene proto-back-arc basin: Wanganui Basin, New Zealand

“…It is more likely that the lowstand sediment pathways were directed through Cook Strait and into the Hikurangi Trough. This hypothesis is supported by the fact that much of the sediment in the Giant Foresets Formation was eroded from the uplifting Southern Alps and supplied by longshore drift along of the west coast of South Island (Hansen and Kamp, 2002), as attested to by the existence of the Farewell Rise (Lewis et al, 1994;Nodder, 1995), close to the shelf-edge, that parallels the Kapiti-Manawatu Fault System and Patea-Tongaporutu High. Most of these highs were exposed during glacial sea-level lowstands of sea-level and probably formed barriers to any westward-oriented sediment transport pathways.…”

“…1). Instead, a well developed system of localised, SE-NW-oriented distributary channels is observed beneath the Farewell Rise at present-day water depths of 90-100 m (Nodder, 1995). The channelized unconformities beneath Farewell Rise represent lowstand incision and erosion during the penultimate glaciation (isotope stage 3) (Nodder,Fig.…”

“…We have not been able to trace these unconformities with any confidence east of the Farewell Rise towards the WB. Proctor and Carter (1989) and Lewis et al (1994) suggest that even at the last glacial maximum, when sea-level was approximately 110-120 m below present-day levels, a substantial embayment separated the Marlborough Sounds and the Wanganui shelf with the Farewell Rise being breached or overtopped about 15 000 years ago during the subsequent transgression (Nodder, 1995).…”

“…6C) that are each characterised by basal obliqueparallel and chaotic reflections infilling smooth channels (facies F1). On such a shallow depositional platform as the Wanganui shelf (e.g., Nodder, 1995;Gillespie et al, 1998), these channel-fill deposits are interpreted as the remnants of lateral accretion bedding, infilling fluvial or estuarine channels (e.g., Lericolais et al, 2001;Proust et al, 2001b). These deposits are overlain by thin to transparent, fairly continuous, sub-parallel reflections (F2) that complete the infilling and drape the channel incisions.…”