摘要
由于志留泥盆纪之间没有发生明显的生物更替现象，所以泥盆纪最早期（Ｌｏｃｈｋｏｖｉａｎ）的珊瑚仍保留着浓厚的志留纪珊瑚的色彩。真正的泥盆纪类型的珊瑚是从早泥盆世中期（Ｐｒａｇｉａｎ）才开始兴起的，至晚泥盆世早期（Ｆｒａｓｎｉａｎ）末惨遭绝灭。晚泥盆世晚期（Ｆａｍｅｎｎｉａｎ）的珊瑚却与石炭纪珊瑚有着较为密切的关系。晚泥盆世的珊瑚经历了绝灭残存复苏３个发展阶段。泥盆石炭纪之交，泥盆纪最晚期（Ｓｔｒｕｎｉａｎ）的珊瑚再遭绝灭，至石炭纪初代之于Ｔｏｕｒｎａｉｓｉａｎ型的珊瑚。正当华南锡矿山（相当于Ｆａｍｅｎｎｉａｎ早期）的珊瑚群罹难的时刻，新疆北部洪古勒楞（亦相当于Ｆａｍｅｎｎｉａｎ早期）却形成了Ｆ／Ｆ大绝灭后生物理想的避难所。
Zhu et al. (1994) have reported the conodonts from the Permian Triassic boundary beds of the Dongling section at Qinshuiyan Township of Xiushui County,and the Yangou section at Rongshan Town of Leping City.The present authors have made a fresh collection from the two sections centimetre by centimetre with the discovery of many conodont specimens of Hindeodus parvus Morphotype 1 and Isarcicella staeschei ,and one of I.isarcica. The exact horizon from which Hindeodus parvus Morphotype 1 first appears could be precisely defined.The boundary beds of the Dongling section consist of clay bed (5-6cm)and Dayie Limestone; Hindeodus parvus Morphotype 1 just began to appear at the lowest horizon of the Dayie Limestone,indicating that the biostratigraphic boundary of the Permian Triassic is coincided with the lithostratigraphic boundary (between the clay bed and limestone,or between JD6 and JD7),and only 5-6cm higher than the eventostratigraphic boundary(between JD5 and JD6).The Yangou section of Leping also consists of limestone. Hindeodus parvus Zone is only 36cm in thickness,and Isarcicella isarcica Zone is first found in this section.The conodont faunas from the two sections are very simple,with no any neogondolellid elements,indicating a shallow water facies,which is quite different from the Changxing section at Meishan.Dongling section represents a typical shallow water facies at the beginning of the Triassic.
出处
《古生物学报》
CAS
CSCD
北大核心
1997年第2期143-150,共8页
Acta Palaeontologica Sinica
基金
国家自然科学基金
中国科学院古生物与古人类学科特别支持经费
关键词
泥盆纪
珊瑚
绝灭
复苏
底栖动物组合
P/T boundary, H.parvus Zone, I.staeschei Zone,evolutionary lineage,conodont zones,pelagic,shallow water,ostracodes,Jiangxi
