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在自然界中,每一种生物都有其一定的生活环境;反之,在一定的环境中有一定的生物生存,即有一定的生物组合。因此,可以利用生物组合来推测古代沉积环境。生物组合类型就应成为“相”的标志之一。 为了能更全面地反映古代生物群面貌,我们在确定生物组合类型时,不单应用了大古生物资料,更重要的是应用了微体古生物和生物化石碎片的资料,因为它们在碳酸岩中保存得最多,最好。 通过对桂西北地区隆林——田林一带四条剖面的生物组分的统计分析,初步划分出了13个生物组合类型。根据J.L.威尔逊的相模式,它们分别属于第5、6、7和8相带。
In nature, each creature has its own living environment; the other hand, in a certain environment there is a certain biological survival, that is, there is a certain biological combination. Therefore, biological combinations can be used to infer the ancient sedimentary environment. The type of biological combination should become one of the signs of “phase”. In order to reflect the features of ancient biota more fully, we not only applied the paleontology data when determining the types of biological assemblages, but more importantly, the data of the microfacies paleontology and biological fossil fragments have been used because they are preserved in carbonate rocks Most, best. Through the statistical analysis of the biological components of four sections in the Longlin-Tianlin area of northwest Guangxi, 13 biological combinations were initially divided. According to J. L. Wilson’s phase pattern, they belong to the 5th, 6th, 7th and 8th phases, respectively.