ABSTRACT

The Dapingian and lower Darriwilian graptolite succession of the Krapperup drill core from Scania, southern Sweden, provides a detailed insight into the axonophoran (biserial) graptolites and their early Palaeozoic evolutionary changes on the Scandinavian platform. Even though earliest Darriwilian axonophorans are not represented, the succession includes faunal elements of the basal Darriwilian Arienigraptus zhejiangensis Subzone of the Levisograptus austrodentatus Biozone, followed by Levisograptus mui and Levisograptus sinicus specimens higher up in the successsion. The highest interval is referred to the Eoglyptograptus cumbrensis Biozone and bears a number of axonophoran elements, including Oelandograptus oelandicus and Undulograptus camptochilus, previously known exclusively from chemically isolated material from the island of Öland. The top of the interval investigated is below the base of a carbonate-rich interval correlated with the Komstad Limestone of Scania, indicating that the investigated interval entirely belongs to the upper part of the Tøyen Shale Formation. Pseudisograptus manubriatus and Pseudisograptus koi are not restricted to the upper Dapingian, but range into the basal Darriwilian. Arienigraptus robustus n. sp. from the uppermost Dapingian, and Arienigraptus delicatus n. sp. and Arienigraptus balticus n. sp. from the basal Darriwilian, are described as new species.

摘要

来自瑞典南部斯堪尼亚的Krapperup钻芯的大坪阶和下达里维尔阶云母岩层序提供了详细的洞察力，帮助人们了解轴索齿石（双相）云母岩及其在斯堪的纳维亚平台上的早期古生代演化变化。即使没有代表最早的达里维利轴突，该序列也包括了Levisograptus austrodentatus生物区的基础Darriwilian浙江亚群的动物区系，其次是Levisograptus mui和Levisograptus sinicus标本。最高的间隔被称为Eoglyptograptus cumbrensis生物区，并带有许多轴突元素，包括Oelandograptus oelandicus和Undulograptus camptochilus，以前仅以厄兰岛的化学分离材料为名。研究的区间的顶部低于与斯堪尼亚的考姆斯塔德石灰岩相关的富含碳酸盐岩的区间的底部，这表明研究的区间完全属于Tøyen页岩组的上部。Pseudisograptus manubriatus和Pseudisograptus koi不仅限于大坪阶上段，还可以进入基底Darriwilian段。Arienigraptus粗壮ñ。sp。来自最上层的大坪ian和Arienigraptus delicatus n。sp。和波罗的海的Arienigraptus。sp。来自基底达里维利人，被描述为新物种。