Research for sea-level changes on marine Middle to Late Pleistocene deposits in Japan and New Zealand

博索半岛的Kazusa群和Shimousa群是日本海相更新世沉积的层型。下马群由几个受冰川游动控制的旋流组成。本研究的结论之一是该群的基底组为覆盖在一宿组上的砾石层组成的长滨组，属于和usa群，边界清晰，命名为长滨不整合。最近的研究表明，不整合形成于海相同位素阶段16。新西兰Wanganui盆地有一个明显的海相更新世地质演替，Pillans（1990）提出了海相地层与台地的对比。然而，我在1993年进行的实地调查产生了一个关于这种相关性的问题。我在海岸的上韦斯特米尔粉砂岩和丘陵地区的马罗罗阶地沉积中发现了一些薄的黑色凝灰岩层，它们很有可能是同一层。如果我的观察是正确的，那么皮兰关于卡斯尔克利夫海岸的演替与梯田漂移之间的相关性将不得不被修正。由于阿拉腊塔阶地与朗吉塔瓦浮石在地层上是固定的，一些高于朗吉塔瓦阶地的阶地必须分别向更古老的阶段移动。新版本的优点之一是溶解了一个矛盾，即朗吉塔托阶地形成于海相同位素阶段12，即低海平面阶段。此外，如果球台地对应于同位素阶段15，则在台地对应于阶段16之前推断出明显的低海平面，称为极低海平面。渤索长滨组基底面与旺加努伊地区海田砂基底面具有显著的低海平面对应关系。

The Kazusa and the Shimousa Groups in the Boso Peninsula are stratotypes of Japanese marine Pleistocene deposits. The Shimousa Group comprises several cyclothems controlled by glacial eustasy. One of conclusions of this study is that the basal formation of the Group is the Nagahama Formation composed of gravel bed overlying the Ichijuku Formation, which belongs to the Kazusa Group with clear boundary named the Nagahama Unconformity. Recent studies had cleared that the unconformity was formed at marine isotope stage 16.An obvious geological succession of marine Pleistocene in Wanganui Basin, New Zealand, have been researched by many workers and the correlation for marine stratigraphy and terraces had been proposed by Pillans(1990). A question arose, however, about the correlation by my field survey at 1993. I found some thin black colored tuff layers interbedded Upper Westmere Siltstone at the coast and the Marorau terrace deposits at the hilly district, and there is a great possibility that they are the same layers.If my observation is correct, Pillans's correlation between the succession at Castlecliff coast and the flight of terraces will be obliged to revise. As the Ararata terrace is fixed stratigraphically with Rangitawa Pumice, some terraces higher than the Rangitatau terrace must be shifted their stratigraphic horizons to older stages, respectively. One of the merits of new version is dissolution of a contradiction, which the Rangitatau terrace was formed during marine isotope stage 12, namely, low sea-level stage. Moreover, if the Ball terrace corresponds to isotope stage 15, inferred obvious low sea-level at just before the terrace corresponds to stage 16 which is said as extreme low sea-level. The basal surface of the Nagahama formation of the Boso is correlated to the one of the Sea field Sand of the Wanganui district by remarkable lowstand of sea-level.