桂林及其周边下石炭统黄金组生物地层研究

Chronostratigraphy of the Lower Carboniferous Huangjin Formation in Guilin and Its Surroundings

摘要: 桂林及其周边地区下石炭统黄金组地层部分出露，它的地层里有很多古生物化石。包括珊瑚、腕足类、棘皮类以及其他化石。这对现有的古生物地层研究具有重大意义。在现有的研究工作基础上，本文对大圩的钓鱼山，磨盘山以及白竹境水库进行实际勘察及剖面研究，并采集回部分古生物化石。根据实测研究，黄金组地层的主要岩性为中厚层泥晶灰岩与薄层泥灰岩互层，化石主要集中在泥晶灰岩以及泥灰岩和泥晶灰岩交界处。在这些化石中发现的有Kueichouphyllum (贵州珊瑚属)、Gystiphyllum (泡沫珊瑚属)、Productida (长身贝属)、Dictyoclostus sp. (网格长身贝)、Crinoidea (海百合属)等。其化石赋存形态体现出黄金组地层的沉积环境。

Abstract: The stratigraphy of the Lower Carboniferous Huangjin Formation is partially exposed in Guilin and its surrounding areas, and its stratigraphy contains a large number of palaeontological fossils, including corals, brachiopods, echinoderms and other fossils, which is of great significance to the existing research on palaeontological stratigraphy. On the basis of the existing research work, this paper carries out the actual survey and profile study on Diaoyu Mountain, Mopan Mountain and Baizhujing Reservoir in Daxu, and collects some palaeontological fossils back. According to the survey, the main lithology of the Huangjin Formation is interbedded with medium-thick micritic limestone and thin marl, and the fossils are mainly concentrated in the micritic limestone and the junction of micritic limestone and marl. The fossils found include Kueichouphyllum, Gystiphyllum, Productida, Dictyoclostus sp., Crinoidea and so on. The fossils are in the form of fossils reflecting the depositional environment of the stratum of the Huangjin Formation.