---

作 者 ：阎同生 钱金平 袁金国 王健

期 刊 ：植物学通报 2000年 17卷 专辑期 页码：190-198

关键词：河北；秦皇岛柳江；华夏植物群；古环境；

摘 要 ：河北秦皇岛柳江晚古生代地层发育，华夏植物群特征明显，向北300公里即达华夏植物群与安加拉植物群混生带，本文详细研究了河北秦皇岛柳江晚古生代植物化石，发现植物化石44属86种，其中蕨类占首位，石松居第二位，并有苏铁、银杏、科达等植物，植物群具有华夏植物群的特点，可划分出6个植物组合，反映植物群演化具有阶段性。植物群演化阶段与古地理环境变化阶段基本同期。据本溪组与太原组中数层海相灰岩的存在，证明该区曾有浅海分布，山西组中、上部转变为三角洲、河口沙坝及堤外泥坪沉积，上、下石盒子组及石千峰组则变为干旱气候环境下陆相湖泊及河流沉积，植物群演化过程阶段性研究表明植物群演化与古地理演化密切相关。

Abstract:The fossil plants which we studied in this paper were collected from the upper Corboniferous and Permian strata in Liujiang coalfield, Hebei Province. This region located in the area near the mixed flora zone between Cathaysia and Angara flora. The flora was composed of 86 species in 43 genus belonging to Filicopsida, Pteridospermopsida, Sphenopsida, Cycadopsida, Cordaitopsida, Ginkgopsida and Coniferae. The most plants were Filicopsida and Pteridospennopsida, the second precedence plants were Lycopsida, in proper order were Cordaitopsida, Ginkgopsida and Coniferae. This flora possessed charateristic of Cathaysia flora, we can made off six plants assembled in this flora. The evolution of palaeogeography has a same pace with flora evolution. In Bensi and Taiyuan formation we fond some layers limestone in sedimentary and distermined there are shallow sea water distributed in this area. This area was in the cabonate shelf-terriction and exploratiogenous sand bar, lagoon, tidal flat environments. In Shanxi formation only one or two layer limestone in sedimentary, indicated the sea water gradually withdraw from this area. the environments changed into indelta environments. At the end of Shanxi age, the delta environment was gradually replaced by the fluvial environment. In Shihezi age, the paleoclimate changed into dry climate, the river and lake sedimentary became vary developing. The evolution of Cathaysion Flora has close coordination to the palaeo geography evolution. Studing of this evolution regulars pattern has important magnificence for exploration and indicate the stratigraphic in mineral production.

---