Lake sediment archives covering several glacial cycles are scarce in the Southern Hemisphere and they are challenging to date. Here we present the chronostratigraphy of the oldest continuous lake sediment archive in Tasmania, Australia; a 5.5 m and 270 ka (Marine Isotope Stage 8) sediment core from Lake Selina. We employ radiometric dating (radiocarbon and optically stimulated luminescence) and relative dating (geomagnetic and climate comparisons). Bayesian modeling of the radiometric ages reaches back to 80 ka (1.7 m) and relative dating using a dynamic programing algorithm allows dating of the full sequence. Elemental data, magnetic properties and beryllium isotopes from Lake Selina reveal a close fit to Antarctic ice core climate proxies. Weaker correlation during the Last Glacial Period (MIS 2–4) is attributed to additional local factors impacting Lake Selina proxies at a time of climate changes and human arrival into Tasmania. Over that period, full vector paleomagnetic records and authigenic ¹⁰Be/⁹Be ratios are combined to identify the Laschamp geomagnetic excursion for the first time in Australia and constrain the chronology. The multi-method approach provides two preferred age models, indiscernible within their uncertainties, which allows the use of a geomagnetic dipole-independent (full archive) or a climate-independent (111 ka to present) age model.

在南半球，涵盖几个冰川周期的湖泊沉积物档案稀少，并且至今仍具有挑战性。在这里，我们介绍了澳大利亚塔斯马尼亚岛上最古老的连续湖泊沉积物年代学的地层。来自塞利纳湖的5.5 m和270 ka（海洋同位素第8期）沉积岩心。我们采用辐射测年（碳碳化合物和光学激发的发光）和相对测年（地磁和气候比较）。辐射年龄的贝叶斯建模可以追溯到80 ka（1.7 m），并且使用动态编程算法的相对年代可以对整个序列进行年代。塞利纳湖的元素数据，磁性和铍同位素表明，它非常接近南极冰芯气候代理。在上个冰期（MIS 2–4）期间，相关性较弱是由于在气候变化和人类进入塔斯马尼亚时影响塞利纳湖代理的其他局部因素。在此期间，完整的矢量古磁记录和自成因^结合10 Be / ⁹ Be比率来首次在澳大利亚识别Laschamp地磁偏移，并限制了年代。多方法方法提供了两个首选的年龄模型，它们在不确定性内是无法区分的，这允许使用与地磁偶极无关的（完整档案）或与气候无关的年龄模型（至今为111 ka）。