ABSTRACT The graptolite biostratigraphy of the 116.11-m-long Röstånga-2 drill core from Scania, southern Sweden, includes the Darriwilian (Middle Ordovician) Holmograptus lentus, Nicholsonograptus fasciculatus, Pterograptus elegans, Pseudamplexograptus distichus and Jiangxigraptus vagus biozones, and the lower Sandbian (Upper Ordovician) Nemagraptus gracilis Biozone. The early Darriwilian Komstad Limestone was not reached. The succession includes numerous levels of brecciated rocks and slickensides, suggesting considerable tectonic deformation and possible gaps. The boundary between the Almelund Shale Formation (below) and the Sularp Shale Formation (above) has been identified at 19.55–19.70 m, where the Fågelsång Phosphorite Bed has been identified tentatively in the Jiangxigraptus vagus Biozone. The first specimens of Nemagraptus gracilis appear higher in the succession. The international correlation of the Darriwilian graptolite succession is discussed.

中文翻译：

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Röstånga-2 钻芯的奥陶纪笔石生物地层学（斯堪尼亚，瑞典南部）

摘要 来自瑞典南部斯堪尼亚的 116.11 米长的 Röstånga-2 钻芯的笔石生物地层包括 Darriwilian（中奥陶世）Holmograptus lentus、Nicholsonograptus fasciculatus、Pterograptus elegans、Pseudamplexus上奥陶世) Nemagraptus gracilis Biozone。早期的 Darriwilian Komstad 石灰岩尚未到达。该系列包括多层次的角砾岩和滑坡，表明存在相当大的构造变形和可能的裂缝。Almelund 页岩组（下）和 Sularp 页岩组（上）之间的边界已被确定在 19.55-19.70 m，其中 Fågelsång 磷矿床已在江西格拉普图斯迷走生物区中初步确定。Nemagraptus gracilis 的第一个标本在序列中显得更高。讨论了 Darriwilian 笔石序列的国际相关性。