Holocene regressive strandplains that preserve a series of former shorelines are extensive on coasts that were remote from major Pleistocene ice sheets (for example, Australia and Brazil), whereas transgressive barrier islands are typical in glacial forebulge regions (for example, North America and Europe). In strandplains, the regressive phase of strandline development was preceded by a transgressive phase during the final stages of postglacial sea‐level rise. This study examines the turnaround from transgression to regression through chronostratigraphic description of three barrier systems in south‐eastern Australia: Seven Mile Beach, Bengello Beach and Pedro Beach. The authors reconstruct geomorphic and depositional histories using ground‐penetrating radar and vibracores along transects across the landwardmost ridges, and optically‐stimulated luminescence and radiocarbon dating. At the Seven Mile Beach barrier system, extensive washover deposits are preserved that include distinctive, landward‐directed, flame‐shaped washover fans along the bayside shoreline of the landwardmost ridge. Landward‐dipping ground‐penetrating radar reflections in radargrams provide evidence of the culmination of the transgressive phase and transition into the regressive phase dominated by progradation, evidenced by the change to seaward‐dipping reflections. A similar progradational plain formed at the Bengello Beach barrier system, but transgressive deposits are largely absent at the site investigated, where an eroded headland created limited accommodation space until sand supply was sufficient for progradation. The Pedro Beach barrier system depositional history is more complex. There, a smaller embayment filled rapidly during the mid‐Holocene, and transgressive sands were deposited as sea level reached its present level and impounded a wetland. Accommodation space in the embayment was filled by ca 4000 years ago. Overall, results indicate that the Holocene turnaround transition occurred between 8400 and 7000 years ago, and was preserved at the landward margin of these three strandplains. Holocene morphostratigraphy differs among sites primarily as a function of sea level, sediment supply and antecedent topography.

中文翻译：

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澳大利亚东南部全新世屏障系统从海侵到回归的转变：地貌，地质框架和年代学

保留了一系列先前海岸线的全新世退化链平原在远离主要更新世冰盖的海岸（例如，澳大利亚和巴西）上广泛分布，而在海冰前缘地区（例如，北美和欧洲），典型的海侵性隔离岛。在平原地区，在冰川期后海平面上升的最后阶段，处于发展阶段的退缩阶段之前是进入海侵阶段。这项研究通过年代地层描述研究了澳大利亚东南部的三个屏障系统：从海侵到回归的转变：七个英里海滩，Bengello海滩和佩德罗海滩。作者利用穿透地面的雷达和沿最陆脊的样带的颤动岩心重建地貌和沉积历史，以及光激发的发光和放射性碳测年。在“七哩滩”屏障系统中，保留了大量的冲刷沉积物，其中包括沿最向脊的海湾岸线的独特的，向内引导的，火焰状的冲刷风扇。雷达图中向地面浸入的穿透地面的雷达反射提供了海侵阶段达到顶点并过渡到以繁殖为主的回归阶段的证据，向海浸反射的变化也证明了这一点。在Bengello海滩屏障系统处形成了类似的退化平原，但在所调查的地点几乎没有海侵沉积物，那里被侵蚀的岬角形成了有限的容纳空间，直到供沙足以进行退化为止。佩德罗海滩屏障系统的沉积历史更为复杂。在整个全新世中期，一个较小的堤坝迅速充满，随着海平面达到目前的高度并蓄积了湿地，海侵性的沙土被沉积。换乘处的住宿空间已被大约4000年前 总体而言，结果表明全新世转折过渡发生在8400至7000年前，并保留在这三个链平原的陆缘。不同地点的全新世地层学主要是由于海平面，沉积物供应和先前地形的不同而不同。