The Rosario section in northeastern Mexico and its potential as a reference section for the Turonian-Coniacian boundary

Turonian/Coniacian （T/C）边界目前尚未定义，尽管有几个剖面被认为具有GSSP（全球边界层型剖面和点）的潜力。罗萨里奥采石场位于墨西哥科阿韦拉西北部，由53米厚的石灰岩和泥灰岩沉积而成。沉积序列在岩石地层上是连续的，单调的，没有大的凝结或裂谷。沉积物沉积在距离最近的海岸线数百公里的远端海洋环境中，富含可诊断年龄的无脊椎动物（如菊石、菊石）。然而，当试图将现有的生物分带和delta13C曲线与其他剖面相关联时，就会出现详细的挑战。关于接种层记录的完整性和精度，特别是在临界边界区间，需要解决一些重要的问题。从目前的角度来看，罗萨里奥剖面是世界上扩展最多的Turonian-Coniacian剖面之一，也是潜在的GSSP T/C边界候选者。我们在此要求有机会重新记录和重新采样El Rosario采石场剖面，以便进行高分辨率的生物地层和地球化学分析，以改进远距离对比（例如与欧洲）。生物地层学将得到稳定同位素地层学的支持和精细化，并通过Sr同位素对事件进行年龄标定。我们将评估罗萨里奥剖面作为Turonian/Coniacian边界GSSP的潜力。

The Turonian/Coniacian (T/C) boundary is undefined today, although several sections have been considered regarding their potential as a GSSP (Global Boundary Stratotype Section and Point). The Rosario quarry site in northwest Coahuila, Mexico, comprises a 53 m thick sedimentary succession of limestone and marl. The sedimentary succession seems lithostratigraphically continuous and monotonous without major condensation or hiati. Sediments were deposited in a distal marine environment hundreds of kilometres from the nearest shore line and are rich in age-diagnostic invertebrates (e.g. inoceramids, ammonites). However, when trying to correlate the existing biozonation and the delta13C curve with other sections, challenges appear in detail. Important questions need to be solved regarding the completeness and precision of the inoceramid record, particularly in the critical boundary interval. From the current point of view, the Rosario section is among the most expanded Turonian-Coniacian boundary sections worldwide and a potential GSSP candidate for the T/C boundary. We here ask for the opportunity to re-log and re-sample the El Rosario quarry section in order to carry out high-resolution biostratigraphical and geochemical analyses, for the refinement of long-distance correlation (e.g. to Europe). Biostratigraphy will be supported and refined by stable isotope stratigraphy with proper resolution, and the events will be age-calibrated by Sr isotopy. We will like that evaluate the potential of the Rosario section as GSSP for the Turonian/Coniacian boundary.