辽东半岛南部寒武系与奥陶系界线

BOUNDARY OF CAMBRIAN AND ORDOVICIAN IN SOUTHERN LIAODONG PENINSULA

笔者(1989)在辽东半岛南部复州湾和金县七顶山寒武系与奥陶系界线附近发现一层笔石,它们为:Airograptus furciferus,Staurograptus sp.,Dendrograptus sp.,并且建立了 Airograptus furciferus-Staurograptus 带,该带相当于华北的 Dictyonema flabelliforme-Staurograptus 带,相当于华南东南区的Staurograptus-Anisograptus 带,其层位相当于英国的特马豆克阶。由于该区寒武系顶部已建立了笔石带Dictyonema kelanense 带,因此,笔者将辽东半岛南部寒武系与奥陶系界线划在 Airograptus furciferus-Staurograptus 带与 Dictyonema kelanense 带之间。

The Graptolites of one layer were found out near the boundary of Cambrian and Ordovician in Fuzhouwan and Qidingshan of Jinzhou,S.Liaodong peninsula by the author in 1989,they were Airograptus furciferus,Staurograptus Staurograptus sp., Dendrograptus sp.,and Airograptus furciferus-Staurograptus zone was also set up, commensurate with Dictyonema flabelliforme-Staurograptus zone in North China,or Staurograptus-Anisograptus in the southeast of South China,located in lower Xinchang Stage of Early Ordovician,or Tremadocian Stage in England.Because of Dictyonema kelanense zone of upper Cambrian having been set up the bounday of Cambrian and Ordovician was delimited between Dictyonema kelanense zone and Airo- graptus furciferus-Staurograptus zone.