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首次在青海西宁盆地新近纪河湖相沉积地层中发现了三趾马、副板齿犀牙齿化石,对化石的基本特征和埋藏情况进行了描述,三趾马化石经鉴定为东乡三趾马。结合区域和前人资料认为,本次发现化石的岩石地层应该属于咸水河组或以上层位,时代为晚中新世早期。分析前人孢粉资料认为化石形成时的古植被为森林-草原,古气候环境为亚热带干旱气候环境。这一发现为西宁盆地晚新生代河湖相地层格架的建立,提供了古生物学依据,对西宁盆地中新世地层确立起到时序标尺的作用。为青藏高原东北缘盆地的环境演化、地层划分、时代厘定提供了新的资料,对深入研究青藏高原隆升环境效具有重要意义。同时,也为青藏高原东北缘、华北地区、青藏高原三趾马动物群进行对比研究,提供了基础材料。
For the first time in the Xining Basin in Qinghai Province, sedimentary strata of Neogene found in the trigeminal horseshoe, deputy plate teeth rhinoceros fossils, the basic characteristics of fossils and burial were described, three-eared fossil identified as Dongxiang three-eared horse. Combined with regional and previous data, it is considered that the fossil-bearing rock strata should belong to the Xianshuihe Formation or above and that the age was earlier than the late Miocene. According to the data of former sporopollen, the ancient vegetation at the time of fossil formation is considered as the forest-grassland, and the paleoclimatic environment is the subtropical arid climatic environment. This finding provides a paleontological basis for the establishment of Late Pleistocene river-lake facies stratigraphy in the Xining basin, and plays a role in establishing a time scale for the Miocene strata in the Xining basin. Which provides new information for the environmental evolution, stratigraphic division and age determination of the northeastern margin of the Qinghai-Tibet Plateau. It is of great significance to further study the environmental effect of the Qinghai-Tibet Plateau uplift. At the same time, it also provides the basic materials for the comparative study of Triassic fauna in the northeastern margin of the Qinghai-Tibet Plateau, North China and the Qinghai-Tibet Plateau.