滇西保山地区丁家寨组、卧牛寺组牙形刺的时代

本首次描述了滇西保山卧牛寺组及永德丁家寨组的Rabeignathus牙形刺动物群，其中2个新种：Rabeignathus yunnanensis sp．nov．，R．ritterianus sp．nov．，并划分出3个牙形刺带，进一步确定了古生物地层工作争论已久的卧牛寺组的时代为Artinskian晚期-Kungurian早期；丁家寨组上段为Sakmarian晚期-Artinskian早期。该牙形刺动物群为暖温型动物群，结合保山地块当时的古地磁资料，丁家寨组、卧牛寺组沉积之时，应处于边缘冈瓦纳区。卧牛寺组玄武岩喷发时间的确定，预示了保山地块从边缘冈瓦纳区分离出来的时间为Artinskian晚期。

THE CONODONT AGES OF THE DINGJIAZHAI AND WONIUSI FORMATIONS IN THE BAOSHAN AREA, WESTERN YUNNAN

Conodont faunas from the Dingjiazhai and Woniusi Formations in the Baoshan area, including two new species: Rabeignathus ritterianus sp.nov. and Rabeignathus yunnanensis sp.nov., and other species, clearly indicate that the age of the upper part of the Dingjiazhai Formation is the latest Sakmarian to early Artinskian, and the age of the Woniusi Formation is late Artinskian , possibly, to early Kungurian, Early Permian. These conodont faunas should belong to warm water facies rather than cool water facies. The Dingjiazhai and Woniusi formations were deposited on the Peri-Gondwana. The displacement age of the Baoshan block from the Peri-Gondwana was in late Artinskian indicated by the eruptive basalts of the Woniusi Formation.