Construction of Global standard of micropaleontology at the Triassic/Jurassic boundary

通过三叠纪/侏罗纪界线微体古生物学研究项目，我们获得了以下成果：1）Pantaneltanuense被认为是Hettangian时代（早侏罗世）的全球性标志种之一。Archaeocenosphaera laseekensis和Praehexasaturnalis tetraradiatus也是Hettangian的良好指示物。gen.et 3）特征类群Spongotrochus sp.（Carter 1994）和Canoptum spp.，它们跨越T/J边界，在三叠纪末的大灭绝中幸存下来。对放射虫的观察表明，由于其独特的摄食系统，Canoptum spp.具有较强的耐受性，从而使其能够抵御三叠纪末期的危机。4）日本（犬山）和加拿大（夏洛特女王群岛）的跨T/J界线区系更替模式相似，但区系组成和优势种存在差异。（5）日本、菲律宾、新西兰和加拿大之间的槽区动物比较，日本与菲律宾、新西兰与加拿大之间的T/J界线附近的动物亲缘关系较强。

We have obtained the following results through this Triassic/Jurassic (T/J) boundary research project on micropaleontology,1) Pantanellium tanuense is considered to be one of global index species of Hettangian age (Earliest Jurassic). Archaeocenosphaera laseekensis and Praehexasaturnalis tetraradiatus are also good indicators for the Hettangian.2) The end of Triassic is marked by the final occurrences of Globolaxtorum tozeri, Hagiastrid? gen.et sp.Indet A, and Risella spp.3) The characteristic taxa, Spongotrochus sp.(Carter 1994) and Canoptum spp.are recognized, which occur across the T/J boundary surviving the mass extinction at the end of Triassic. Observation of Living Radiolaria suggests that the Canoptum spp.have tolerance of the crisis of end of the Triassic because of its unique feeding system that differs from other extinct multicyrtids.4) The pattern of the faunal turnover across the T/J boundary is similar between Japan (Inuyama) and Canada (Queen Charlotte Islands) although there are differences among faunal contents and dominated species. The faunal change is subdivided into 3 stages.5) Trough faunal comparison between Japan, Philippine, New Zealand and Canada, the faunal affinity around the T/J boundary is strong between Japan and Philippine, and also New Zealand and Canada.