松辽盆地北部青山口组介形类化石保存与沉积环境

OSTRACODA FOSSIL PRESERVATION AND DEPOSITIONAL ENVIRONMENT IN OINGSHANKOU FORMATUON IN NORTH SONGLIAO BASIN

尽管松辽盆地青山口组沉积时期介形类化石的属种相同或相近，但在不同的沉识相区介形类的发育、繁盛和化石的埋藏、保存有着显著差异。依据松辽盆地北部百余口并中的化石资料，研究了介形类化石的种属数量、丰度、分异度、壳体颜色、单双壳比例、壳内充填物及在地层中保存状况等特点，探讨上述特点与沉积环境的关系。说明湖生介形类不仅受生存条件的制约，其化石保存也受沉积环境的控制。进而可以根据介形类化石的埋藏、保存指明沉积环境。

There are abundant nonmarine ostraceda fossils inoingshankou Formation,SongliaoBasin,which was formed in one of the lake-developing peried in geologic record.The ostra-codas were large in number and forined layered ostracOda carbonate rocks. The ostracedafossils were obviously different in abundance and preservation. Combining fossil preservationfeature with depOsitional environment,we can not only reveal the relationship betweenthem,but also use the ostraceda fossil to point out depositional environment.Therefore,thesedimentary facies with ostraceda and rock feature is clearly shown.