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首页> 外文期刊>Stratigraphy >Chitinozoan biostratigraphy of the Upper Ordovician D. clingani and P. linearis graptolite biozones on the Island of Bornholm, Denmark
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Chitinozoan biostratigraphy of the Upper Ordovician D. clingani and P. linearis graptolite biozones on the Island of Bornholm, Denmark

机译：丹麦博恩霍尔姆岛上奥陶纪D. clingani和P. linearis笔石遗迹生物带的甲壳动物生物地层学。

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摘要

The last decade saw a revival of the debate on the exact stratigraphical position of the Upper Ordovician P. linearis graptolite biozone. Chitinozoan biostratigraphy can be useful to help address this question. Here, we provide a high-resolution chitinozoan biostratigraphy through the Dicellograptus Shale Formation at Vasagard on the Island of Bornholm (Denmark), which recently also was subject to a thorough revision of its graptolite fauna, representing the Dicellograptus folicaceus, Dicranograptus clingani and Pleurograptus linearis biozones. We have identified close to 9000 individual chitinozoan vesicles from 26 samples through the upper c. 9m of the Dicellograptus Shale Formation. The Spin- achitina cervicornis, Fungochitina spin if era and Tanuchitina bergstroemi chitinozoan biozones are identified, and their boundaries carefully calibrated against the revised graptolite biostratigraphy. A correlation with the chitinozoan biozonation in the British Cautley district, which has a predominantly Baltoscandian, mid-latitude signature and is well-correlated with the graptolite and shelly fauna biozones described from the historical type region, is established.
机译：在过去的十年中，关于上奥陶纪线虫P. gratis斜纹岩生物带的确切地层位置的辩论得以恢复。甲壳动物生物地层学可能有助于解决这个问题。在这里，我们通过博恩霍尔姆岛（丹麦）Vasagard上Disloglograptus页岩层提供了高分辨率的甲壳动物生物地层学，最近它也经历了对其笔形动物区系的彻底改造，这代表了Dicellograptus folicaceus，Dicranograptus clingani和Pleurograptus linearis生物区。我们已经从26个样品中通过上部c鉴定出接近9000个壳多糖。 Dicellograptus页岩组9m。识别了棘轮梭菌，Fungochitina梭梭时代和Tanuchitina bergstroemi chitinozoan生物区，并针对修订后的笔石生物地层学仔细校准了它们的边界。建立了与英国考特利地区的甲壳动物生物带的相关性，该地区主要具有巴尔托斯堪的，中纬度的特征，并且与从历史类型区域描述的笔石和有壳动物区系生物带高度相关。

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