摘要
由于印支运动的结果,我国晚三叠世卡尼期地层分布局限。川西北广元县至什邡县分布的地台型海湾相卡尼期地层称汉旺组。此组下段含菊石Trachyceras, Protrachyceras, Clionites等,相当于下卡尼阶;该段下部厚0—37m,为海百合、钙藻生物骨屑灰岩滩相;上部厚32—91m,为亮晶鲕粒灰岩滩相。汉旺组上段含菊石Tropites, Discotropites, Hanaceras,Buchites等,相当于上卡尼阶;该段下部厚3—16m,为生物骨屑灰岩滩相;
Systematic work has been completed on the Late Triassic Carnian sponge fossils collected from northwestern Sichuan. It is found that the sponges of this region are mainly of Lychniscosa. The Upper Triassic sequence in the world has been treated as a 'long time break' in the evolution of all sponges, especially of Lychniscosa. The discovery of the Lychniscosa fauna in this region is of great significance.
出处
《古生物学报》
CAS
CSCD
北大核心
1990年第3期349-363,405-407,共15页
Acta Palaeontologica Sinica
基金
国家自然科学基金资助课题
