Magnetostratigraphic correlation of Late Cretaceous and Early Paleogene vertebrate-bearing deposits, Nemegt Basin, Mongolia

70多年前，蒙古发现了丰富的恐龙动物群。这是第一批发现了蛋和巢的恐龙。从那时起，由于波兰、俄罗斯、日本和北美的研究团队过去70年在蒙古的工作，我们对恐龙行为和栖息地的了解大大增加了。然而，蒙古恐龙的年龄仍然不确定。放射性年龄测定所需的岩石不存在于含恐龙的沉积物中，因此已证明不可能获得年龄数据。最初，这些恐龙被认为是北美坎帕尼亚恐龙和马斯特里赫特恐龙(大约8300-6500万年前)的祖先；后来有人提出，也许蒙古恐龙在时间上更接近北美恐龙。该项目将对岩石样品进行古地磁分析，以便将蒙古的恐龙动物群置于更高分辨率的年代地层框架内。Pi目前最好的估计是蒙古恐龙动物群的年龄为坎帕尼亚(约8000万年前)。

9980397Fastovsky Over 70 years ago, rich dinosaur faunas were discovered in Mongolia. These were the first dinosaurs for which eggs and nest were found. Since then, our understanding of dinosaur behavior and habitats has been greatly increased as a result of the past 70 years of works in Mongolia by Polish, Russian, Japanese, and North American research teams. The age of the Mongolian dinosaurs, however, has remained uncertain. The rocks necessary for radiometric ages dates are not present in the dinosaur-bearing sediments, so age dates have proven impossible to obtain. Originally these dinosaurs were thought to be ancestral to Campanian and Maastrichtian (ca. 83-65 million year old) North American forms; later it was suggested that perhaps the Mongolian dinosaurs were closer in time to the North American dinosaurs. This project will perform paleomagnetic analysis on rock samples in order to place the dinosaur fauna of Mongolia into a higher resolution chronostratigraphic framework. PI's best estimate at present place the Mongolian dinosaur faunas as Campanian in age (ca. 80 million years old).