新疆柯坪巴立克立克组腕足动物群

报道和首次描述巴立克立克组腕足动物共30属39种,其中1新属7新种.该动物群具有石炭、二叠系过渡的性质,时代属于阿舍尔末期至萨克马尔最初期.Choristites qiudaisaiensis-Costifrina indicus 带分为 Postamartinia granulipwa-Rugivestis kutorgae 上亚带和 Costiferina punilus-Meckella hemiplicata 下亚带.下亚带属于阿舍尔末期,上亚带属于萨克马尔最初期,石炭、二叠乐界线置于下、下亚带之间,该动物群生物地理区系属古地中海大区,次级区系特征不明显,具混合性质。

BRACHIOPOD FAUNA AROUND CARBONIFEROUS-PERMIAN BOUNDARY FROM BALIKELIKE FORMATION IN KEPING, XINJIANG

The brachiopod fauna of balikelike Formation is described for the first time from Keping, Xinjiang Autonomous Region. There are 39 species in 30 genera, with inclusion of 7 new species and 1 new genus. The age of the fauna is considered to be from late Late Asselian to early Early Sakmarian, according to the simultaneous appearance of Choristites and Costiferina as well as distribution of a lot of species. On the basis of evolution and range of Brachiopods, the Choristites qiudaisaiensis-Costiferinaindicuss zone is recognized, which is divided into two subzones: the Costiferina pumilus- Meekella hemiplicata subzone and the Upper Postamartinia grandiplica-Rugivestis Kutorgae subzone. The Carboniferous-Permian boundary is settled down between the Lower and Upper subzone. Paleobiogeographically, the brachiopod fauna of Keping belongs to the Tethyan ream, but subdivision is difficult because of the mixed characteristics of the fauna.