摘要
豫皖交界的白大山地区,沉积一套浅变质碎屑岩夹碳酸盐岩组合,以往被划归青白口系刘老碑组。笔者首次于该套地层灰岩段中发现牙形刺化石,岩石虽受区域性变质作用,但牙形刺Belodina compressa,Panderodus gracilis,Pseudobelodina dispansa?保存完好,时代为晚奥陶世,本区牙形刺的发现为白大山群的地质时代归属提供了重要证据。
In the Baidashan area near the border between Anhui and Henan provinces, lightly metamor phosed clastic rocks with carbonate interbeds of the Baidashan Group have been regarded as the early Neoproterozoic （Qingbaikouan） and correlated with the Liulaobei Formation. However, our investigation of these rocks has recovered late Ordovician conodonts from the carbonate units. Despite metamorphism, Belodina compressa, Panderodus gracilis and Pseudobelodina dispansa ？ have been identified, indicating an late Ordovician age. This discovery provides important evidence for the geological age of the Baidashan Group.
出处
《地层学杂志》
CSCD
北大核心
2014年第2期200-203,共4页
Journal of Stratigraphy
基金
安徽省2012年度公益性地质调查项目(2012-g-36)资助
关键词
生物地层
牙形刺
白大山群
上奥陶统
霍邱
安徽
biostratigraphy, conodonts, Baidashan Group, Upper Ordovician, Huoqiu, Anhui
