山西新荣地区巨型蜥脚类恐龙股骨化石的发现及其埋藏环境
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摘要
首次在山西新荣地区晚白垩世助马堡组发现了巨型蜥脚类恐龙股骨化石。通过详细观测该股骨化石的保存状态、保存长度和股骨近端最大长度,估算该股骨化石实际长度约1. 9 m,该蜥脚类恐龙体长可能超过30. 0 m。在对化石层沉积相和古流向分析的基础上,分析了该股骨化石的埋藏环境。助马堡组为一套规模大、弯曲度高、水动力强的曲流河沉积,该蜥脚类恐龙死后在曲流河中经短—中距离搬运后被埋藏。新荣地区巨型蜥脚类恐龙股骨化石的发现,不仅扩大了晚白垩世巨型蜥脚类恐龙在中国北方地区的分布范围,同时对左云—新荣地区白垩纪古气候和古环境的研究具有重要意义。
Recently the gigantic sauropod femur fossils have been first discovered in Zhumapu Formation of Upper Cretaceous in Xinrong area of Shanxi Province. Through the observation of preservation occurrence,remaining length and proximal end of the femur,the authors estimated the real length of the femur and the body length of this sauropod. It turns out that the real length of this femur is probably 1. 9 m and the body length of the sauropod may reach more than 30. 0 m. Furthermore,based on the analysis of sedimentary facies and paleocurrent directions,the authors discussed the burial environment of the femur fossils. The results show that Zhumapu Formation belongs to the meandering river deposit with grand scale,high degree of curvature and strong hydrodynamic force.This sauropod has been buried in the meandering river after a short-medium distance transportation. Discovery of the gigantic sauropod in this area has not only expanded the distribution range of gigantic sauropods in Late Cretaceous in North China,but also is of great significance to Cretaceous paleoclimate and paleoenvironment research in Zuoyun-Xinrong areas.
Recently the gigantic sauropod femur fossils have been first discovered in Zhumapu Formation of Upper Cretaceous in Xinrong area of Shanxi Province. Through the observation of preservation occurrence,remaining length and proximal end of the femur,the authors estimated the real length of the femur and the body length of this sauropod. It turns out that the real length of this femur is probably 1. 9 m and the body length of the sauropod may reach more than 30. 0 m. Furthermore,based on the analysis of sedimentary facies and paleocurrent directions,the authors discussed the burial environment of the femur fossils. The results show that Zhumapu Formation belongs to the meandering river deposit with grand scale,high degree of curvature and strong hydrodynamic force.This sauropod has been buried in the meandering river after a short-medium distance transportation. Discovery of the gigantic sauropod in this area has not only expanded the distribution range of gigantic sauropods in Late Cretaceous in North China,but also is of great significance to Cretaceous paleoclimate and paleoenvironment research in Zuoyun-Xinrong areas.
引文
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[4] You H L,Li D Q,Zhou L Q,et al. Daxiatitan binglingi:a giantsauropod dinosaur from the Early Cretaceous of China[J]. GansuGeol,2008,17(4):1-10.
[5]莫进尤,黄超林,赵仲如,等.中国广西晚白垩世一新的巨龙类恐龙[J].古脊椎动物学报,2008,46(2):147-156.
[6] LüJ C,Xu L,Jia S H,et al. A new gigantic sauropod dinosaurfrom the Cretaceous of Ruyang,Henan,China[J]. Geol Bull Chi-na,2009,28(1):1-10.
[7] Wang R F,You H L,Xu S C,et al. A new hadrosauroid dinosaurfrom the early Late Cretaceous of Shanxi Province,China[J].PLOS ONE,2013,8(10):1-12.
[8] Wang R F,You H L,Xu S C,et al. A second hadrosauroid dino-saur from the early Late Cretaceous of Zuoyun,Shanxi Province,China[J]. Hist Biol,2017,29(1):17-24.
[9]董黎阳,伊剑,刘颖超,等.山西左云地区下白垩统左云组沉积相及其古气候意义[J].地质论评,2018,64(2):392-404.
[10]山西省地质矿产局.山西省区域地质志[M].北京:地质出版社,1989:1-617.
[11]李振宏,渠洪杰,杨永恒,等.云岗盆地晚中生代沉积-火山充填序列及其构造意义[J].中国地质,2016,43(5):1481-1494.
[12]山西省地质矿产局.山西省岩石地层[M].武汉:中国地质大学出版社,1997:251-259.
[13] Weishampel D B,Dodson P,Osmolska H. The dinosauria[M].California:University of California Press,2007:614-626.
[14] D’Emic M D,Mannion P D,Upchurch P,et al. Osteology of Hua-beisaurus allocotus(Sauropoda:Titanosauriformes)from the Up-per Cretaceous of China[J]. PLOS ONE,2013,8(8):1-29.
[15]庞其清,程政武.山西天镇晚白垩世蜥脚类恐龙一新科[J].地质学报,2000,74(1):1-9.
[16]吕君昌,胡平.山西大同市郊区发现的恐龙化石[J].古脊椎动物学报,1998,36(3):252-256.