西北地质2017，Vol.50Issue(1)：1-3,3.
Climacograptus longxianensis在甘肃平凉的发现及地质意义
The Discovery of Climacograptus longxianensis in Pingliang,Gansu Province and Its Geological Significance
摘要
Abstract
The Upper Ordovician Longmendong Formation on the southwestern margin of Ordos platform is disputed since its nomination.Its main difference from Pingliang Formation is the formation age.The former consists of five graptolite zones, which are Glyptograptus teretiusculus zone, Nemagraptusgracilis zone, Climacograptus peltifer zone, C.longxianensis zone and C.spiniferus zone, but the latter one only comprises the first two graptolite zones.Recently, through the study on this area, two more graptolite zones have been discovered in Pingliang Formation,including Climacograptus bicornis zone and C.longxianensis zone.As a result, the age range of Pingliang Formation is nearly same as the one of Longmendong Formation.In addition, they have the same lithological characters and are formed in the same tectonic environment, so they are synonym.According to the stratum nomination rule, the Longmendong Formation is suggested to be abandoned, while the Pingliang Formation is suggested to be used.关键词
Climacograptus longxianensis/笔石/平凉组/龙门洞组/奥陶系Key words
Climacograptus longxianensis/graptolite/Pingliang Formation/Longmendong Formation/Ordovacian分类
天文与地球科学引用本文复制引用
谢从瑞,付力浦,朱小辉,王洪亮,周志强..Climacograptus longxianensis在甘肃平凉的发现及地质意义[J].西北地质,2017,50(1):1-3,3.基金项目
中国地质调查局"祁连山地区区域地质调查片区总结与服务产品开发"项目(DD20160345-16) （DD20160345-16）
