Abstract During the latest Turonian – early Coniacian time, a succession of sand-rich, Gilbert-type deltas was deposited along the faulted margin of the Bohemian Cretaceous Basin (BCB, Central Europe), fining along depositional dip into prodeltaic heterolithic facies and offshore mudstones to marlstones. The active tectonic setting with accelerated subsidence and supply rates contributed to deposition and preservation of an expanded record showing otherwise insufficiently known parts of the Turonian-Coniacian (T–C) boundary interval. In this study a combination of detailed biostratigraphy, genetic sequence stratigraphy, and carbon isotope chemostratigraphy is employed to characterize the T–C boundary in the northern part of the BCB, in both nearshore and offshore facies. The basis of the biostratigraphic framework was the establishment of the same succession of inoceramid bivalves and other molluscan marker taxa and bioevents as that in Salzgitter-Salder (Germany) and Slupia Nadbrzezna (Poland). All the faunal markers from the Mytiloides scupini through Cremnoceramus crassus crassus inoceramid zones were found both in the nearshore and offshore facies. The linkage of biostratigraphic and carbon isotope-stratigraphic data to a regional stratigraphic picture, as well as to individual outcrop and core sections, provides an important new database for further study of the boundary interval, with a direct link to the transgressive-regressive history of the nearshore depositional systems. Therefore it is proposed here that the T–C interval in the BCB complements the Salzgitter-Salder and Slupia Nadbrzezna sections and together with them constitutes a broader type region for definition of the T–C boundary.

中文翻译：

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扩大的硅质碎屑岩序列中的土伦阶-康尼亚阶边界：波西米亚白垩纪盆地三角洲至近海相的综合地层

摘要 在最近的土伦阶 - 早康涅茨纪时期，一系列富含砂的吉尔伯特型三角洲沿波西米亚白垩纪盆地（BCB，中欧）的断层边缘沉积，沿沉积倾角细化为前三角洲异岩相和近海泥岩到泥灰岩。具有加速下沉和供应速率的活动构造环境有助于沉积和保存扩展记录，该记录显示了土伦阶 - 科尼亚阶 (T-C) 边界区间的其他部分知之甚少。在这项研究中，详细的生物地层学、遗传序列地层学和碳同位素化学地层学相结合，用于表征 BCB 北部近岸和近海相的 T-C 边界。生物地层框架的基础是建立了与 Salzgitter-Salder（德国）和 Slupia Nadbrzezna（波兰）相同的 inoceramid 双壳类和其他软体动物标记分类群和生物事件。从 Mytiloides scupini 到 Cremnoceramus crassus crassus inoceramid 区的所有动物标记都在近岸和近海相中发现。生物地层学和碳同位素-地层学数据与区域地层图以及各个露头和岩心剖面的联系，为进一步研究边界间隔提供了一个重要的新数据库，与海侵-海退历史有直接联系。近岸沉积系统。