COLLABORATIVE RESEARCH: High-Resolution Event Stratigraphy of the Kope-Corryville Sequence in the Type Cincinnatian

目前辛辛那提类型的命名框架表明，其潜在的岩石地层复杂性阻碍了其丰富的化石生物群在古生态和宏观进化研究中的利用。然而，最近的几项研究表明，这种明显的复杂性部分是由于命名本身的困难造成的。该研究的目的是通过使用事件视界进行对比，为辛辛那提地区的Kope至Corryville组（Edenian- Maysvillian）开发一个高分辨率的年代地层框架，该框架超越了地层命名法，包括：海侵面、外缘、地震破坏层、具有不寻常沉积学特征的风暴层，以及与海平面相关的岩石和动物特征的地层“尖峰”。将对整个地区的一系列野外地点和岩心进行测量和详细描述，并收集和分析动物样本，以划定研究区间内的事件视界。以前的调查表明存在着几个这样的视界，预计我们为此目的专门设计的工作将允许确认更多的视界。结果将是一系列的剖面和地图，说明层序的年代地层格架。作为这一框架的第一次应用，我们将在记录的事件视界上进行一系列梯度分析，以校准在伊甸纪和梅斯维尔纪特定时期古环境和古群落的横向变异程度。

The current nomenclatural framework for the type Cincinnatian suggests an underlying lithostratigraphic complexity that inhibits utilization of its rich fossil biota for paleoecological and macroevolutionary investigations. However, several recent studies indicate that this apparent complexity is partly an artifact of difficulties with the nomenclature itself. The purpose of the research is to develop a high-resolution chronostratigraphic framework for the Kope through Corryville Formations (Edenian- Maysvillian) in the Cincinnati region that transcends stratigraphic nomenclature through the use of event horizons for correlation, including: transgressive surfaces, epiboles, earthquake-disrupted beds, storm beds with unusual sedimentological features, and sea level-associated stratigraphic "spikes" in lithologic and faunal characteristics. A series of field localities and cores from throughout the region will be measured and described in detail, and faunal samples collected and analyzed, to delineate event horizons within the study interval. Previous investigations indicate the presence of several such horizons, and it is anticipated that our work designed specifically for this purpose, will permit the recognition of several more. The result will be a series of cross- sections and maps illustrating a chronostratigraphic framework for the sequence. As a first use of this framework, we will conduct a series of gradient analyses on documented event horizons to calibrate the degree of lateral variability in paleoenvironments and paleocommunities at specific times during the Edenian and Maysvillian stages.