ABSTRACT Silurian strata within the tristate area of Indiana, Ohio, and Kentucky have been thoroughly studied for well over a century. Due to rapid facies changes throughout the region numerous lithostratigraphic terminologies were established, many of which were difficult to correlate even over short distances. Recently these stratigraphic complexities have received renewed interest due to advancements in bio-, chemo-, and sequence stratigraphy that greatly improved our understanding of the tristate area. These improvements had significant implications for our ability to correlate Rhuddanian through lower Sheinwoodian strata between the Appalachian and Illinois basins and allowed unified nomenclatural and sequence stratigraphic hierarchies for this interval to be developed across the Cincinnati Arch. Recent advancements in regional chronostratigraphy of Silurian strata, however, highlight several discrepancies with regards to the 3rd- and 4th-order sequence stratigraphic hierarchies assigned within these basins. In an effort to alleviate these points of disagreement, we contribute new δ13Ccarb chemostratigraphic and sequence stratigraphic analyses of a basinward Appalachian section from Scioto County, Ohio, spanning upper Telychian through Gorstian strata assigned to the Estill through Tymochtee formations, complemented by gamma-ray core scans for localities traversing northwestward from the sampled core section into western Ohio. These new data allow unified nomenclatural and sequence stratigraphic hierarchies to be developed throughout the region for strata spanning the upper Telychian through Gorstian stages. Additionally, these findings highlight a significant shift in the primary sites of sediment accommodation during the studied depositional interval.

中文翻译：

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通过将牙形石和碳同位素生物化学地层学与伽马射线和层序地层学相结合，对横跨辛辛那提拱门（美国）的志留纪进行高分辨率事件地层学 (HiRES)

摘要 一个多世纪以来，人们对印第安纳州、俄亥俄州和肯塔基州三州地区的志留纪地层进行了深入研究。由于整个地区的快速相变，建立了许多岩石地层学术语，其中许多即使在短距离内也难以关联。最近，由于生物地层学、化学地层学和层序地层学的进步极大地提高了我们对三州地区的了解，这些地层复杂性重新引起了人们的兴趣。这些改进对我们通过阿巴拉契亚盆地和伊利诺伊州盆地之间的较低 Sheinwoodian 地层关联 Ruddanian 的能力具有重要意义，并允许在整个辛辛那提拱门上开发该间隔的统一命名和层序地层层次结构。然而，志留系地层区域年代地层学的最新进展突出了在这些盆地内分配的 3 级和 4 级层序地层层次的几个差异。为了缓解这些分歧点，我们提供了新的 δ13Ccarb 化学地层学和层序地层分析，对俄亥俄州 Scioto 县向盆地的阿巴拉契亚部分进行了新的 δ13Ccarb 化学地层和层序地层分析，该地层跨越上 Telychian 到通过 Tymochtee 地层分配给 Estill 的 Gorstian 地层，辅以伽马射线核心扫描从采样的核心部分向西北穿越到俄亥俄州西部的地点。这些新数据允许在整个地区开发统一的命名和层序地层层次，用于跨越上特里奇阶到戈尔斯蒂阶的地层。此外，