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

土仑阶/科尼亚阶（T/C）的界线至今尚未确定，尽管有几个剖面被认为有可能成为全球界线层型剖面和点（GSSP）。位于墨西哥科阿韦拉西北部的罗萨里奥采石场由53 m厚的石灰岩和泥灰岩沉积层组成。沉积序列在岩石地层学上连续而单调，没有大的凝缩或间断。沉积物沉积在距离最近的海岸线数百公里的远距离海洋环境中，并富含可确定年龄的无脊椎动物（例如，无角菊石、菊石）。然而，当试图将现有的生物分区和三角洲13 C曲线与其他部分相关联时，挑战出现在细节上。关于接种层记录的完整性和精确性，特别是在临界边界间隔内，需要解决一些重要问题。从目前的角度来看，罗萨里奥剖面是全球范围内扩展最广的土伦-科尼亚西安边界剖面之一，也是T/C边界的潜在GSSP候选者。我们在此要求有机会对El罗萨里奥采石场部分重新记录和重新取样，以便进行高分辨率生物地层学和地球化学分析，完善远距离对比（例如与欧洲）。生物地层学将得到具有适当分辨率的稳定同位素地层学的支持和完善，事件将通过Sr同位素进行年龄校准。我们将评估罗萨里奥段作为土伦/科尼亚西安边界的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.