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Theropod, avian, pterosaur and arthropod tracks from the Latest Cretaceous of Paredon, Coahuila, northeastern Mexico, and their significance for the end-Cretaceous mass extinctiion

墨西哥东北部科阿韦拉州帕雷登白垩纪末期的兽脚亚目、鸟类、翼龙和节肢动物足迹及其对白垩纪末大规模灭绝的意义

基本信息

批准号：
286455674
负责人：
Professor Dr. Eberhard Frey
金额：
--
依托单位：
Institut für Geowissenschaften
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2017-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/286455674?language=en
关键词：
Theropod avian pterosaur arthropod tracks

项目摘要

Within DFG project we recently revised two unique localities that combine an unusual diversity of avian, pterosaurian and dinosaur tracks as well as trails of invertebrates, namely arthropods. These localities (Amargos, San Francisco) were discovered by us in uppermost Maastrichtian siliciclastic delta sediments of the Las Encinas Formation in the Mexican state of Coahuila, about 40 km north of Saltillo. The majority of the trackways was produced by at least five different types of birds, while trackways of azhdarchoid pterosaurs are rare and only a single footprint of a non-avian theropod was found. Our initial data therefore provide substantial evidence for a gradual decline in this area of both dinosaurs and pterosaurs and simultaneous radiation of birds prior to the end of the Cretaceous. We have evidence that the sediment containing the trackway assemblage was deposited during the very latest Maastrichtian. This is indicated by an up to 2.5 meter thick unit with abundant smectite spherules attributed to the Chicxulub impact at less than 8.5 meters distance up-section at Amargos. Sphenodiscus pleurisepta is the last ammonite at Amargos and may have crossed the K/Pg boundary into the earliest Paleocene. We here propose to discuss the scenarios above by recording the stratigraphic assignation of sediments and the turnover in tetrapods based on new K/Pg boundary sections discovered by us in the area and by the application of new methods. Furthermore, we will execute a monographic ichnopalaeontologic revision of the trackways.

在DFG项目中，我们最近修改了两个独特的地点，结合了鸟类，翼龙和恐龙的足迹以及无脊椎动物，即节肢动物的足迹的不寻常的多样性联合收割机。我们在墨西哥科阿韦拉州（Saltillo以北约40 km）Las Encinas组的Maastrichtian硅质岩三角洲沉积物中发现了这些地点（Amargos、San弗朗西斯科）。大部分的足迹是由至少五种不同类型的鸟类产生的，而azhdarchoid翼龙的足迹是罕见的，只有一个非鸟类的兽脚亚目恐龙的足迹被发现。因此，我们的初步数据提供了大量的证据，在这方面的恐龙和翼龙的逐渐下降和同时辐射的鸟类在白垩纪结束之前。我们有证据表明，含有轨道组合的沉积物是在最晚的马斯特里赫特时期沉积的。这一点可以通过一个厚达2.5米的单元来证明，该单元含有大量的蒙皂石小球，这归因于希克苏鲁布撞击，其距离在阿马尔戈斯的上段不到8.5米。Sphenodiscus pleurisepta是最后一个菊石在Amargos和可能已经越过K/Pg边界进入最早的古新世。本文拟根据我们在该区发现的新的K/Pg界线剖面，应用新的方法，通过记录沉积物的地层归属和四足动物的更替，对上述情景进行讨论。此外，我们将执行专题遗迹古生物学修订的轨道。