我国早期后生动物群的特异埋藏机理探讨

通过对早期后生动物群产出层位的沉积特征、沉积层序和化石埋藏特征的研究，认为在海湾和局限海环境，早期后生动物群往往产于海侵体系中，而陆棚环境则保存在低水位体系；同时提出了两种早期后生动物群埋藏保存机理，一种是沉积事件（风暴流或浊流）破坏了生物生态环境，使生活在正常环境中的生物大量死亡，并被快速埋藏保存；另一种是海平面脉动引起环境变化，使早期后生动物死亡，在还原环境下埋藏保存。因此，认为海平面变化与早期后生动物群的埋藏保存有着密切关系。在提出两种早期后生动物群特异埋藏机理的基础上，并认为由前寒武纪至寒武纪，只要沉积环境、沉积序列类似，就有可能发现早期后生动物群，这对寻找新的早期后生动物群具有重要的指导意义。

Discussion on Taphonomy of Early Metazoen Biota in China

The following results are obtained from the study of taphonomic characteristics fossil taphonomic sequence and sedimentary sequence of early metazoen biota discovered in China:(1)The emdedded and preserved condition is controlled by event layer(tempestite or turbidite)ard sedimentation rate takes main part in fossil embedition and preservation.(2)Close relationship preservation of the early metazoen biota between sea-level changes,this is,which always occur in transgressive system of shallow water bay and restricted sea, early metazoen biota occur in the shelf margin systems. Based on sedimentary evironments of the early metazoen biota.two buried models of the early metazoen biota are established Eventualy,it is indicated that new early metazoen biota may be discovered by above-mentioned condition which is benefit to preserve biota.