The timing of the flooding of the Danish/German/Swedish straits and the first marine influence in the Baltic Basin after the Ancylus Lake stage has been much debated. Here we present 47 new radiocarbon ages from sediment cores retrieved from Danish waters, ages that record the marine transgression of the area. Most of the ages are based on shells of marine molluscs, hence the ages are uncertain because we do not know the precise reservoir age in the past. We use a reservoir age of 400 years, which is based on dating of museum specimens collected live before testing of nuclear bombs. It appears from the ages that the Great Belt (Storebælt) was inundated before The Sound (Øresund). The oldest ages on marine shells from the northern part of the Great Belt region are about 8.9 cal. ka BP. From the central part of the Great Belt, the oldest ages are about 8.2 cal. ka BP, in Mecklenburg Bay 8.1 cal. ka BP and in the Arkona Basin 7.1 cal. ka BP. Sediments deposited prior to the occurrence of marine molluscs contain brackish-water ostracods (Cyprideis torosa and Cytheromorpha fuscata); the sediments are usually laminated and non-bioturbated mud. The brackish-water phase may have lasted 500–1000 years. The youngest lake deposits without signs of marine influence are dated to c. 8.8 cal. ka BP (central Great Belt), 8.7 cal. ka BP (Little Belt) and 8.5 cal. ka BP (Arkona Basin). We see no evidence for marine influence at c. 10 cal. ka BP as recorded by some studies from the Baltic Basin.

中文翻译：

---

在全新世期间，波罗的海和卡特加特海峡之间的海峡何时被海水淹没？

丹麦/德国/瑞典海峡洪水泛滥的时间以及 Ancylus 湖阶段后波罗的海盆地的第一次海洋影响引起了很多争论。在这里，我们展示了 47 个新的放射性碳年龄，这些年龄来自从丹麦水域取回的沉积物岩心，这些年龄记录了该地区的海侵。大多数年代是基于海洋软体动物的贝壳，因此年代是不确定的，因为我们不知道过去确切的储层年代。我们使用 400 年的水库年龄，这是基于在核弹试验之前现场收集的博物馆标本的年代测定。从古时看来，Great Belt (Storebælt) 在 The Sound (Øresund) 之前就被淹没了。大带地区北部海洋贝壳的最古老年龄约为 8.9 卡。卡 BP。从大带的中心部分，最年长的年龄约为 8.2 卡路里。ka BP，在梅克伦堡湾 8.1 cal。ka BP 和在阿科纳盆地 7.1 cal。卡 BP。在海洋软体动物出现之前沉积的沉积物含有微咸水介形动物（Cyprideis torosa和Cytheromorpha fuscata ); 沉积物通常是层状和非生物扰动的泥浆。咸水相可能持续了 500-1000 年。没有受海洋影响迹象的最年轻的湖泊沉积物可追溯到c。8.8 卡路里 ka BP（中央大带），8.7 卡路里。ka BP（小腰带）和 8.5 卡路里。ka BP（阿科纳盆地）。我们在c处没有看到海洋影响的证据。10 卡路里 ka BP 根据波罗的海盆地的一些研究记录。