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拴马桩煤系植物化石研究结果表明，华北地台北部晚石炭世的古植被在维斯发期和斯蒂芬期之交发生了重要变化：斯蒂芬期以前，种子蕨类占主导地位，随后是以Ｐｅｃｏｐｔｅｒｉｓ为代表的树蕨真蕨类植物和有节类成了植被的主要类群。这种型式的古植被改变不仅与华北晚古生代植物群成分在本溪组与太原组界线上出现的真蕨类、有节类＂新生峰点＂相一致，而且与欧美基本植被在维斯发Ｄ期－斯蒂芬期的改组大体吻合。据叶相及煤中的碳同位素分析，晚石炭世晚期存在一个古气候升温事件。上述古植被的改组可能是这个升温事件的正反馈。
The study on the phytoliths of the Tiemadian coal measures shows that the paleocarpids of the Late Carboniferous in the northern part of the North China Platform have undergone important changes since the Viscet and Stephenian periods. Before the Stephen period, the seed ferns dominates, Tree ferns represented by Pecopteris are true ferns and articulate as the major group of vegetation. This type of ancient vegetation change not only with the North China flora composition in the Benxi group and the Taiyuan group line appear true Fern, there is a section of “freshmen peak” consistent with the basic vegetation in Europe and America in the Vishay D Period - Stephen period of the general reorganization. According to the analysis of carbon isotopes in leaf facies and coal, there was an ancient climate warming event in the late Late Carboniferous. The reorganization of the above ancient vegetation may be positive feedback of this warming event.