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近年来,石油部石油勘探开发科学研究院在渤海湾盆地早第三纪沙河街组中首次发现钙质超微化石.这不仅为该盆地遭受海侵提供佐证,也为研究中国东部的古气候、古地理提供有意义的信息.经鉴定,辽河断陷西部凹陷沙河街组一段下部的钙质超微化石是Retjculofenestra sp.、Co-ccoljthus sp .、Cyclococcocithi-thina sp.东濮凹陷北部地区沙河街组一段下部及沙河街组三段中下部的钙质超微化石是:Reticu-lofenestra sp.、Coccolithus sp.、Coronocyclu(?)?sp..
In recent years, the Petroleum Exploration and Development Research Institute of the Ministry of Petroleum discovered calcareous nannofossils for the first time in the Early Triassic Shahejie Formation in the Bohai Bay Basin, which not only provided evidence for the transgression of the basin but also for the study of paleoclimate in eastern China , Paleogeography to provide meaningful information.It has been identified that the calcareous nannofossils in the lower part of Shahejie Formation in the western depression of Liaohe Fault Depression are Retjculofenestra sp., Co-ccoljthus sp., Cyclococcocithi-thina sp. The calcareous fossils in the lower section of the first section of the Street Group and the middle and lower sections of the third section of Shahejie Formation are: Reticu-lofenestra sp., Coccolithus sp., Coronocyclu (?)? Sp.