Some new opinions about triassic gastropod assemblages in china

摘要

Pan Hua-zhang avanced 7 Triassic marine gastropod assemblages of the southwestern China in 1982. On the basis of the materials about lately described and reported species of Triassic gastropod fossils, these assembages have been revised. Among ther, the Bellerophon asiaticus-Polygyrina depressa assemblage was altered to the Retispira asiatica-Polygyrina depressa assemblage in the Kayitou Formation and the lower part of the Feixianguan Formation (T~1_l); the Worthenia gias-Zygites qingyanensis-Marmolatella planoconvexa assembleage was altered to the Worthenia conica-Neritariacandida-Marmolatella plana assembage in the Qingyan Formation (T~l_2); the Sisenna ninglangensis-Trachynerita wanneri weishanensis-Eucyclus multistriatus assemblage was altered to the Sisenna ninglangensis-s.