Occurrence and significance of Cenomanian belemnites in the lower Danubian Cretaceous Group (Bavaria, southern Germany)
Occurrence and significance of Cenomanian belemnites in the lower Danubian Cretaceous Group (Bavaria, southern Germany)
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多瑙河下游白垩系（德国南部巴伐利亚）塞诺曼阶箭石的出现及其意义
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发表时间：
2010
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通讯作者：
Patrick Chellouche
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作者：
M. Wilmsen;B. Niebuhr;Patrick Chellouche
下多瑙河白垩纪群（DCG，巴伐利亚东北部，德国南部）的箭石记录经过整理、分类描述，并置于该群新的综合地层框架内。来自雷根斯堡以南雷根斯堡下部地层（Saal Member）的三个标本可以归属于 Neohibolites cf. ultimus (d’Orbigny) 的年代为早塞诺曼阶晚期 (Mantelliceras dixoni Zone)。八个标本代表 Praeactinocamax plenus（Blainville），发生在 Eibrunn 地层下部（雷根斯堡地区）或雷根斯堡地层基底（Bodenwohrer Senke 的 Roding 地区）的一次事件（plenus 事件）中。生物地层学和碳稳定同位素表明，DCG 中含有 P. plenus 的箭石层具有与中欧和西北欧其他地区严格相同的年代地层位置（中晚塞诺曼世，中 Metoicoceras geslinianum 区）。然而，下多瑙河白垩纪群的岩石地层单元（即雷根斯堡和艾布伦地层）的特征是具有明显的历时性，这是基于其在塞诺曼阶-早期图伦阶海侵期间的时间海侵（即重叠）沉积。 P. plenus 在中欧岛屿周围的分布可以很容易地通过围绕正区域的迁移来解释，而不需要横跨波希米亚地块的海洋海峡。
The belemnite records of the lower Danubian Cretaceous Group (DCG, northeastern Bavaria, southern Germany) are compiled, taxonomically described and placed within the new integrated stratigraphic framework of the group. Three specimens from the lower Regensburg Formation (Saal Member) south of Regensburg can be assigned to Neohibolites cf. ultimus (d’Orbigny) and are dated as late Early Cenomanian ( Mantelliceras dixoni Zone). Eight specimens represent Praeactinocamax plenus (Blainville) and occur in an event ( plenus Event) in the lower Eibrunn Formation (Regensburg area) or basal Regensburg Formation (Roding area in the Bodenwohrer Senke). Biostratigraphy and carbon stable isotopes suggest that the belemnite horizon with P. plenus in the DCG has strictly the same chronostratigraphic position (mid-Late Cenomanian, middle Metoicoceras geslinianum Zone) as elsewhere in Central and NW Europe. The lithostratigraphic units of the lower Danubian Cretaceous Group (i.e., the Regensburg and Eibrunn formations), however, are characterized by a pronounced diachronism based on their time-transgressive (i.e., onlapping) deposition during the Cenomanian–Early Turonian transgression. The distribution of P. plenus around the Mid-European Island can be easily explained by migration around the positive area without the necessity of a marine strait across the Bohemian Massif.