In a paper from 1942 Johannes Iversen described a warm phase prior to the Allerød warming from lake Bølling in western Denmark and thereby extended the common classification of Lateglacial biostratigraphy. Iversen’s assumptions concerning the Bølling-Oscillation were based on sedimentological features and high Betula (birch) pollen values in two pollen samples prior to the onset of the Allerød warming. Questions regarding the nature of the Bølling warming later became a discussion due to the expansion of terms into different fields and especially with advances in palynology. To further refine the knowledge on the Bølling-Oscillation, Hartmut Usinger investigated the locus classicus in 1982. The method of pollen-size-frequency distribution was applied on birch pollen in order to distinguish between B. nana- and B. pubescens-type pollen, however, the results were never published and got lost over time. Therefore, these data are presented here and the method as described by Usinger (Pollenanalytische und stratigraphische Untersuchungen an zwei Spätglazial-Vorkommen in Schleswig-Holstein, 1975, Danm Geol Unders Årbog, 1977:5–29, 1978a, Pollen Spores 23:389–432, 1981b) is performed on the reassembled dataset again. In order to solve existing ambiguities in Lateglacial terminology, especially concerning the terms Bølling and Meiendorf, we used the data originally compiled by Usinger to discuss it against the background of the previous work by Iversen. Furthermore, the dataset enabled a comparison of different ways to determine between different Betula pollen types. The general focus is set on the distinction of Betula pollen types in order to shed light on the question of the migration of tree birches into northern Europe, especially before the Allerød warming. The results show that the dataset can immensely refine Iversen’s pollen zones. A clear dominance of dwarf birch pollen during the Bølling-Oscillation is demonstrated. Furthermore, the record reveals that Iversen’s assumption concerning the existence of a climatic oscillation prior to the Allerød warming can be confirmed at the locus classicus.

中文翻译：

---

寻找伯灵振荡：来自丹麦伯灵湖的新高分辨率花粉记录

约翰内斯·艾弗森（Johannes Iversen）在1942年发表的一篇论文中描述了从丹麦西部的伯灵湖（Allingød）变暖Allerød之前的暖期，从而扩展了晚冰川生物地层学的普通分类。艾弗森关于伯灵振荡的假设是基于沉积学特征和在Allerød变暖开始之前的两个花粉样本中桦木（桦树）花粉的高值。由于术语的扩展到不同领域，特别是在孢粉学的发展中，有关伯灵变暖性质的问题后来成为讨论。为了进一步完善有关Bölling振荡的知识，Hartmut Usinger研究了经典轨迹1982年在桦树花粉上应用了花粉大小-频率分布方法，以区分B. nana-和B. pubescens型花粉，但是结果从未公布，并且随着时间的流逝而丢失。因此，这里介绍了这些数据，并描述了Useer（Pollenanalytische und Stratigraphische Untersuchungen and zweiSpätglazial-Vorkommen在Schleswig-Holstein，1975年，Danm Geol UndersÅrbog，1977：5–29，1978a，Pollen Spores 23：389– 432，1981b）再次在重新组合的数据集上执行。为了解决后冰河术语中存在的歧义，特别是关于Bølling和Meiendorf的术语，我们使用了Useer最初汇编的数据在Iversen先前工作的背景下进行了讨论。此外，该数据集可以比较不同方式，以确定不同的桦木花粉类型。一般重点放在Betula的区别上花粉的类型，以阐明桦树向北欧迁移的问题，特别是在Allerød变暖之前。结果表明，该数据集可以极大地改善艾弗森的花粉区。证明了伯林振荡期间矮桦花粉的明显优势。此外，记录还表明，艾弗森关于Allerød变暖之前存在气候振荡的假设可以在经典地点得到证实。