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，潜在的岩石地层复杂性阻碍了其丰富的化石生物群用于古生态和宏观进化研究。然而，最近的几项研究表明，这种明显的复杂性在一定程度上是命名本身困难的产物。这项研究的目的是为辛辛那提地区的Kope至Corryville组(Edenian-Maysvillian)建立一个高分辨率的年代地层学框架，通过使用事件层位进行对比，超越地层命名，包括：海侵面、外冰盖、地震破坏层、具有异常沉积特征的风暴层，与海平面有关的地层岩性和动物群特征的“尖峰”。将对整个区域的一系列野外地点和岩心进行详细测量和描述，并收集和分析动物样本，以描绘研究间隔内的事件地平线。以前的调查表明存在几个这样的地平线，预计我们专门为此目的而设计的工作将允许承认更多的地平线。其结果将是一系列横截面和地图，说明了该层序的年代地层框架。作为这一框架的首次使用，我们将在已记录的事件层位上进行一系列梯度分析，以校准伊甸纪和梅斯维利期特定时期古环境和古群落的横向变化程度。

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.