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

通过本次三叠系/侏罗系(T/J)界线微体古生物研究项目，取得了以下成果：1)Tantanellium tanuense被认为是赫堂纪(早侏罗世)的全球指示种之一。2)三叠纪的结束标志是Globolaxtorum tozeri、Hagiastird？Gen.et sp.Indet A和Risella spp.3)发现了横跨T/J界线的特征类群Spongotrochus sp.(Carter 1994)和Canoptom spp，它们在三叠纪末期的大规模灭绝后存活下来。对活体放射虫的观察表明，由于其独特的摄食系统不同于其他已灭绝的多栖动物，它们对三叠纪末期的危机具有耐受性。4)日本(犬山)和加拿大(夏洛特女王群岛)T/J界线上的动物群周转格局相似，尽管它们的动物群含量和优势种有所不同。区系变化可分为3个阶段。5)通过日本、菲律宾、新西兰与加拿大的区系对比，日本与菲律宾、新西兰与加拿大在T/J界线附近的区系亲和力较强。

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.