关键词: 东濮凹陷, 早第三纪, 古生物化石, 地质历史, 沉积环境

Abstract: The evolution features of Ostracode fauna,Dinoflagellate flora etc.are summarized in this paper.There comes that the Sha3 and Sha1 are prosperity summits in early Tertiary biocoenosium in Dongpu sag.The terrestrial and local biocoenosium fossils emerged alternately.The evolution of biocoenosis contains the gradual changes from Ek to early Sha4,early Sha4 to late Sha4,Sha1 to Ed with flood event,and the sudden changes from late Sha4 to Sha3,Sha3 to Sha2,Sha2 to Sha1 accompanied by the events of alternations of the salinity change of the paleolacustrine water and occurence of tempests.The author also ex-pounds an event of the sedimentary gap on the basis of fossil assemblage sequence,sedimentary facies and sedimentary source charateristics.