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The provincialism and assemblages of the eight fossil biotic groups of Jurassic andCretaceous in China (namely, conchostracans, ostracods, bivalves, charophytes, ammonoids, fora-minifers, brachiopods and pollen-spores) are briefly summarized in this paper, and this providesscientific basis for studying the stratigraphical province and classification of this period. 相似文献
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The stratigraphical provinces, subdivisions and correlations of the Early and MiddleJurassic, Late Jurassic, Early Cretaceous and Late Cretaceous are separately discussed accordingto their characteristics of palaeogeography, biogeography and sedimentation. The names forthe typical formations of each stratigraphical province or subprovince are also proposed inthis paper. 相似文献
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叶肢介是一种甲壳动物,主要生活在浅小的淡水水域,少数种属可以生活在半咸水环境。叶肢介在地质历史上演化比较迅速,个体不大,在矿产钻探所取的岩心中经常能够碰到,对陆相地层的划分和对比具有一定意义。叶肢介化石的研究历史已有一百四十多年,但从未有过关于新生代化石材料的发现和报道,因此对叶肢介的演化问题了解得还不系统。本文描述了解放后、特别是无产阶级文化大革命中,在我国江苏、安徽、湖北、甘肃等地第三纪地层中发现的叶肢介化石3科、4属、12种,其中有2新科、3新属,全是新种,并讨论了它们的分类和演化。 相似文献
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