摘要
本文描述采自西藏阿里地区三叠系牙形刺3属10种。据牙形刺属种分布的层位,确定札达县曲松的兰成曲群下组和普兰强拉—多让的当贡拉组为Dienerian阶;札达县马阳的当贡拉组较强拉—多让的当贡拉组层位略高或相当于后者的上部。札达姜叶玛的兰成曲群下组时代大致为Spathian阶。普兰多让—丁嗄山的邓公卡组为Anisian阶。丁嘎山口的共足拉组是本区最高的含牙形刺层位,时限为下Norian阶至上Norian阶下部。
The Triassic conodonts reported in this paper were collected from the Zanda, Burangand Ngari areas of Xizang(Tibet), with only part of them (3 genera and 10 species) des-cribed. The ages of some formations based on conodonts are as follows: Gongzhula For-mation with Epigondolella postera and Neogondolella navicula steinbergensis. Norian;Denggongka Formation with Neogondolella regale, Anisian; Lower Lanchengqu Forma-tion from Gya'nyima with Neogondolella nevadensis, Neospathodus brasoni and N. homeri,Smithian --Spathian; Danggongla Formation with N. dieneri and N. elongatus, Dienerian;Lower Lanchengqu Formation from Qusum with Neogondolella planata, Dienerian.
出处
《微体古生物学报》
CSCD
北大核心
1991年第4期433-440,499,共8页
Acta Micropalaeontologica Sinica
基金
刘本培教授博士导师基金
关键词
牙形刺
三叠纪
西藏
Triassic
conodonts
Ngari
Tibet
