Microfossils from the siltstones and muddy slates:Constraint on the age of the Taowan Group in the Northern Qinling Orogenic Belt,Central China  

作　　者：WANG ZongQi GAO LianDa WANG Tao JIANG ChunFa 

机构地区：[1]Institute of Geology,Chinese Academy of Geological Sciences,Beijing 100037,China

出　　处：《Science China Earth Sciences》2008年第2期172-180,共9页中国科学（地球科学英文版）

基　　金：the Geological Surveying Project of China (Grant No. 1212010611807);the Natural the Major Project of Science and Technologic Support and the National Major Project of Developing Basic Research (Grant No. 2002CB412608)

摘　　要：The age of the Taowan Group is still a hot topic in the Northern Qinling Orogenic Belt, because of limited fossil evidence from these strata and different ideals on the Cambrian fossils of the conglomerate beds and limestone blocks. Early Ordovician acritarchs, chitinozoa and scolecodonts occur in the siltstone and muddy slate beds of the Guoling, Sanchakou, Fengmaimiao and Goushenmiao Formations of the Taowan Group, indicating the age of the Taowan Group should be the Ordovician. These fossil assemblages consist of 7 genera and 13 species of acritarchs, 7 genera and 9 species of chitinozoa, and 2 genera and 2 species of scolecodonts.The age of the Taowan Group is still a hot topic in the Northern Qinling Orogenic Belt, because of limited fossil evidence from these strata and different ideals on the Cambrian fossils of the conglomerate beds and limestone blocks. Early Ordovician acritarchs, chitinozoa and scolecodonts occur in the siltstone and muddy slate beds of the Guoling, Sanchakou, Fengmaimiao and Goushenmiao Formations of the Taowan Group, indicating the age of the Taowan Group should be the Ordovician. These fossil assemblages consist of 7 genera and 13 species of acritarchs, 7 genera and 9 species of chitinozoa, and 2 genera and 2 species of scolecodonts.

关 键 词：Taowan Group MICROFOSSIL Early ORDOVICIAN Northern QINLING OROGENIC Belt 

分 类 号：Q913.2[天文地球—古生物学与地层学]