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首页> 外文期刊>Nature >EXTRAORDINARY PRESERVATION IN A NEW VERTEBRATE ASSEMBLAGE FROM THE LATE CRETACEOUS OF MONGOLIA
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EXTRAORDINARY PRESERVATION IN A NEW VERTEBRATE ASSEMBLAGE FROM THE LATE CRETACEOUS OF MONGOLIA

机译：蒙古晚白垩世一种新的脊椎动物组合的非常规保存

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WE report here a new locality, Ukhaa Tolgod ('brown hills'), from the Upper Cretaceous of the Gobi Desert of Mongolia, which shows an unmatched abundance of well preserved vertebrate fossils, including the highest concentration of mammalian skulls and skeletons from any Mesozoic site. In the main collecting area (about 4 km(2)), recovered and uncollected articulated skeletons of theropod, ankylosaurian and protoceratopsian dinosaurs represent over 100 individuals. Specimens collected also include skulls (many with associated skeletons) of over 400 mammals and lizards, skeletons (including the first known skull) of the bird Mononykus, and nest sites that preserve the first known theropod dinosaur embryos(1). In contrast to other Mesozoic localities, the diversity and abundance of theropods, mammals and lizards are unusually high. The exceptional preservation of vertebrates from the red-bed facies of the Gobi Upper Cretaceous has been attributed to arid conditions(2-4) possibly involving catastrophic death and burial during major sandstorms(5). Although fossils are found in fluvial facies at Ukhaa Tolgod, high concentrations of excellent specimens in aeolian facies support the argument for rapid entombment in sand. This contrasts with conditions for the terrestrial Upper Cretaceous in North and South America, where accretionary preservation of fossils in fluvial deposits predominates. [References: 25]
机译：我们在这里报告了一个新的地方，来自蒙古戈壁沙漠上白垩统的Ukhaa Tolgod（“棕色山丘”），其中显示了保存完好的脊椎动物化石，其数量无与伦比，其中包括来自任何中生代的最高浓度的哺乳动物头骨和骨骼现场。在主要采集区（约4 km（2）），恢复和未采集的节肢动物，甲龙和原角龙恐龙的关节骨骼代表了100多个个体。收集的标本还包括400多种哺乳动物和蜥蜴的头骨（许多带有相关骨骼），鸟类Mononykus的骨骼（包括第一个已知的头骨）以及保留第一个已知的兽脚亚目恐龙胚胎的巢穴（1）。与其他中生代不同，兽脚类，哺乳动物和蜥蜴的多样性和丰富度异常高。戈壁上白垩纪红层相对脊椎动物的特殊保护被归因于干旱条件（2-4），可能涉及重大沙尘暴期间的灾难性死亡和埋葬（5）。尽管在Ukhaa Tolgod的河流相中发现了化石，但在风沙相中高浓度的优质标本支持了将沙快速包埋的观点。这与北美和南美陆生上白垩纪的条件形成鲜明对比，在这些条件下，在河床沉积物中对化石的增生性保存占主导地位。 [参考：25]

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