Palaeobiogeograhic relationships of Early Carboniferous ammonoid assemblages in North America

早石炭纪（密西西比纪）是一个以主要构造板块的结构发生重大变化为特征的时期。华力西造山运动导致了陆棚的分离和随后的菊石群落的地方化。因此，一个亚华力西域（西北和中欧）可以清楚地与一个原泰西域（南欧，北非，南乌拉尔）区分开来。然而，北美的动物区系省份却没有得到很好的研究。在拟议项目中，将对美国中部大陆（阿肯色州、俄克拉荷马州、得克萨斯州）的Ouchita前陆盆地与美国西部（加州、内华达州、犹他州）的Antler前陆盆地的组合进行比较。这两个地区的菊石动物群将在全球范围内进行调查。本项目的目标是定量分析中石炭世菊石类的地理分布模式和适应辐射的时间。

The Early Carboniferous (Mississippian) is a time that is characterised by significant changes in the configuration of the main tectonic plates. The Variscan Orogeny led to the separation of shelves and subsequent provincialism of ammonoid communities. Therefore, a Subvariscan Realm (Northwestern and Central Europe) of can clearly be distinguished from a Prototethian Realm (South Europe, North Africa, South Urals). Faunal provinces in North America, however, are much less well investigated. Within the proposed project, a comparison of the assemblages present in the Ouchita Foreland Basin of the American Midcontinent (Arkansas, Oklahoma, Texas) with the Antler Foreland Basin of the Western United States (California, Nevada, Utah) will be carried out. The ammonoid faunas of these two areas will be investigated in a global context. The goal of the project is the quantitative analysis of the biogeographic patterns and the timing of the mid-Carboniferous adaptive radiation of the ammonoids.