贵州台江早、中寒武世凯里组的遗迹化石

TRACE FOSSILS FROM EARLY-MIDDLE CAMBRIAN KAILI FORMATION OF TAIJIANG, GUIZHOU

凯里组发现遗迹化石９属１４种，主要是以ＰｈｙｃｏｄｅｓｐｅｄｕｍＳｅｉｌａｃｈｅｒ为主的遗迹群落，重要的遗迹属如：Ｃｏｃｈｌｉｃｈｎｕｓ，Ｇｏｒｄｉａ，Ｍｏｎｏｍｏｒｐｈｉｃｈｎｕｓ，Ｏｌｄｈａｍｉａ，Ｐｌａｎｏｌｉｔｅｓ，Ｔｒｅｐｔｉｃｈｎｕｓ等常见于世界各地寒武纪Ｃｒｕｚｉａｎａ遗迹相。根据遗迹化石表明凯里组沉积于盐份、含氧量正常，海水能量中等的浅海软基底潮下带环境。

The trace fossils described here were collected from the Early--Middle Cambrisn Kaili Formation o f Taijiang, Guizhou, southwestern China. They contain 9 ichnogenera and 14 ichnospecieS (including two indeterminable ichnospecies), which are: Cochlichnus anguineus Hitchock,Hitchock, Gordia molassica(Heer),G.Emmons Lophoctenium comosum Richter, Monomorohichnus linearis Crimes,Oldhamia radiata Forbes, Palaeiphycus tubularis Hall, Phycdes pdeum Seilacher P. of.Plamolites montanus (Hall), Phycde ichnosp., Phycde coromatum Crimes and Anderson,Planolites montanus Richter, Planolitesichnosp And Treptichnus cf.bifuurcatus Miller. Although the trace fossils Cruziana and Rusophycus have not been found in the Kaili Formation, this trace fossil association should belong to Seilacher' s Cruziana ichnofacies.In the Kaili Formation Phycodes pedum Seilacher is the predominant trace fossil. The Kaili Formation was deposited in the marine nearshore environments, characteristic of the subtidal, unconsolidated soft substrata; as water turbulence decreased, the sediment feeding became more prevalent, the energy level of the shallow water was moderate, and the salinity and oxygenation in this environment were under a normal marine condition.