本文主要记述近年在四川盆地开展白垩—第三纪生物地层工作中所获的地层新认识与介形类新材料。笔者认为嘉定群与城墙岩群不是平行关系,而是上下关系,前者的最低层位比后者的最高层位还新,天马山组就是压在嘉定群下面的城墙岩群;城墙岩群为晚侏罗至早白垩世中期沉积,嘉定群为早白垩世晚期至第三纪地层。本文报道了四川新近发现的丰富的女星介等化石,讨论了中华金星介等属的分类问题,描述了介形类9属、6亚属、30种,其中包括1新亚属、25新种,丰富了我国非海相白垩纪介形虫化石资料。 This paper mainly describes the new understanding of formation and the new type of orthogonality material obtained in the chalk-Tertiary bio-strata work in Sichuan basin in recent years. The author believes that the Jiading Group and the wall rock group is not a parallel relationship, but the relationship between up and down, the former of the lowest level than the latter of the highest level is still new, the Tianmashan group is under pressure in the Jiading Group wall rock group; wall rock group Late Jurassic to early Cretaceous sediments, Jiading group from Early Cretaceous to Tertiary strata. This article reports on the newly discovered abundant actinidase fossils in Sichuan Province, discusses the taxonomic classification of Sinorhizobium, describes 9 genera, 6 subgenera and 30 species, including 1 new subgenus, 25 new Species, enriching China’s non-marine Cretaceous fossil fossil data.