辽宁北票下白垩统义县组陆家屯层四足类动物化石群落分析  

Analysis on fossil community of tetrapods in Lujiatun bed of Lower Cretaceous Yixian Formation in Beipiao,Liaoning

作　　者：张立军 ZHANG Li-jun(South China Sea Culture Museum,Hainan Tropical Ocean University,Sanya 572022,Hainan,China)

机构地区：[1]海南热带海洋学院南海文化博物馆,海南三亚572022

出　　处：《世界地质》2020年第4期737-745,共9页World Geology

基　　金：海南热带海洋学院引进人才科研启动基金项目(RHDRC202008)。

摘　　要：对2001年以来辽宁省古生物化石专家委员会组织鉴定的960件辽西下白垩统义县组陆家屯层四足类脊椎动物标本进行了个体数量统计,依总数1 522个个体计算了不同属种相对丰度。结合已有的化石和地层学资料,对该批化石进行了动物群及年代地层学分析。陆家屯层是一富含火山碎屑物质的沉积层,属于盆地边缘突发性火山泥石流沉积,时代约为早白垩世Valanginian期至Hauterivian期界线附近。该层发现的四足类动物化石属原地埋藏类型,该化石群落以恐龙类为主。其中,鹦鹉嘴龙属(Psittacosaurus)相对丰度达90%,是优势属;小型兽脚类恐龙以伤齿龙类占优势。哺乳类以爬兽属(Repenomamus)为主。由于发现了多件爬兽属(Repenomamus)个体和鹦鹉嘴龙属(Psittacosaurus)个体共同保存的标本,推测它们之间应该为捕食关系,陆家屯层四足类动物群可命名为'鹦鹉嘴龙-爬兽动物群'(Psittacosaurus-Repenomamus Fauna)。Total 960 tetrapod specimens from the Lujiatun bed,Lower Cretaceous Yixian Formation have been identified by the Paleontological Experts Committee of Liaoning Province since 2001.The relative abundance of 1522 different tetrapod individuals is calculated,this fauna and its geological age is analyzed based on fossil and chronostratigraphic data.The Lujiatun bed is rich in volcanic debris,representing the abrupt volcanic mud flow at the margin of sedimentary basin.The geological age of the bed is roughly Valanginian to Hauterivian,Early Cretaceous.The tetrapods are autochthonous and dominated by terrestrial dinosaurs.Among them,Psittacosaurus is the dominant genus with relative abundance about 90%.Troodontids and Repenomamus is rich in the small theropod dinosaurs and mammals,respectively.Owing to the existence of several specimen which Repenomamus and Psittacosaurus were preserved together,they are considered predator and prey.This fossil community can be named as Psittacosaurus-Repenomamus Fauna.

关 键 词：化石群落 四足类脊椎动物 陆家屯层 义县组 下白垩统 辽宁北票 

分 类 号：Q915[天文地球—古生物学与地层学] P534.53[生物学—古生物学]