甘肃宝积山盆地上三叠统Skolithos遗迹化石研究  

Skolithos FROM THE UPPER TRIASSIC IN BAOJISHAN BASIN OF GANSU PROVINCE

作　　者：刘松[1,2] 曾宪官 陈应权[2] 闫德飞[2] 

机构地区：[1]黔东南苗族侗族自治州地质公园管理局,贵州凯里556000 [2]兰州大学地质科学与矿产资源学院,甘肃兰州730000

出　　处：《甘肃地质》2017年第2期1-6,共6页Gansu Geology

基　　金：国家自然科学基金项目(41272026)资助

摘　　要：在甘肃宝积山盆地上三叠统南营儿组首次发现了遗迹化石,经鉴定将其归为1属2种,为石针迹属(Skolithos)中的垂直石针迹(Skolithos verticalis Hall)、线状石针迹(Skolithos linearis Haldeman)。两种遗迹化石均为垂直或高角度倾斜岩层面的潜穴,接触清楚无衬壁发育,属被动填充。通过对两种遗迹化石的分析认为,晚三叠世时期宝积山盆地气候温暖湿润,河流湖泊发育,研究区此时期可能处在山前盆地河流的下游,随着降水的增多在该区域形成了还原性较强的沼泽、湖泊水域环境。Trace fossils were collected from the Upper Triassic Nanying＇er Formation in the Baojishan Basin, Gansu Province. The fossils were identified as Skolithos verticalis, Skolithos linearis, which belong to one species two genus. Both species are with the characteristics of the vertical or high angle tilt of the rock formation dwelling burrows, without the development of lining, and passive filled. According to the analysis of these fossils characteristics, it showes that the climate of the Baojishan Basin is warm and humid in the Late Triassic. The research area might be in the river downstream of the foreland basin. At that time, the lake level rose and water area enlarged continuously with the increase of rainfall. The basin was with the high energy sedimentary environment characteristics, these areas changed into strong reducibility lakes and swamps.

关 键 词：宝积山 晚三叠世 遗迹化石 Skolithos 

分 类 号：Q911.28[天文地球—古生物学与地层学]