A diverse micro- and macrovertebrate assemblage in the Late Campanian (Late Cretaceous) at Cerro de Angostura near Porvenir de Jalpa, Coahuila, northeast Mexico and its palaeoecological implications

墨西哥科阿韦拉省Porvenir de Jalpa附近的Las Águilas遗址中，脊椎动物遗骸极其丰富，包括坎帕尼亚晚期几种恐龙类群的骨骼和足迹，以及许多其他类群的遗迹，如鳄鱼、五种海龟、蛇颈龙、沧龙、翼龙、暴龙、飞龙、孵化后、幼年和亚成年鸭龙、朗伯龙、鸭龙、角龙和甲龙。它们与大量的海龟、鳄鱼目动物和可能的兽脚亚目动物的粪化石有关。因此，该地点为该地区丰富的动物生活提供了独特的证据，并允许详细重建古生态。我们计划在恐龙开始衰退的时期，对该地区进行彻底的调查，特别是对微脊椎动物和巨形动物进行调查，以增加对该地区古生物学进行高分辨率分析的分类群列表。我们的实地调查方法包括地表调查、浅划痕挖掘和屏幕扫描。在这个项目中，我们还计划调查Saltillo附近的两个新地点，以便在不久的将来进行更大规模的调查。

The Las Águilas site near Porvenir de Jalpa, Coahuila, Mexico, is extremely rich in vertebrate remains comprising both bones and trackways of several dinosaur taxa of late Campanian age, but also remnants of numerous other taxa, such as crocodilians, five turtle species, plesiosaurs, mosasaurids, pterosaurs, tyrannosaurids, dromaeosaurids, post-hatchling, juvenile and subadult hadrosaurs, lambeosaurines hadrosaurids, ceratopsids, and ankylosaurs, which are associated with abundant coprolites of turtles, crocodilians and likely theropods. The locality thus provides unique evidence for the wealth of animal life in the area and allows for a detailed reconstruction of the palaeoecology. We plan to thoroughly survey the area especially for microvertebrates and palynomorphs, in order to increase the list of taxa for a high resolution analysis of the palaeosynecology of the area, during a time when the decline of dinosaurs began. Our investigation methods in the field comprise surface survey and shallow scratch excavations and screen scanning. Within this project we also plan to investigate two new sites in the vicinity of Saltillo for their potential for larger-scale investigation in the near future.