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内蒙古乌达早二叠世(距今约2.9亿年)成煤植物群复原。成煤沼泽森林在火山灰重力作用下枝叶、主干等被埋藏于火山凝灰岩内,为重建其森林面貌提供了绝佳条件。森林高层植被由称为封印木(Sigillaria)的石松类乔木构成;森林中层植被主要是外形与现生桫椤树相似的名为莲座蕨树,以及和分类位置尚不明确的拟齿叶(Paratingia)。其他中层植被种类包括原始苏铁类带羊齿(Taeniopteris),侧羽叶(Pterophyllum);草本植物仅零散分布,包括木贼纲楔叶(Sphenophyllum)和蕨类植物(Peopteris)。
Inner Mongolia Wuda Early Permian (about 290 million years ago) coal-bearing flora recovery. Coal briquette forest under the gravity of volcanic ash, foliage, trunk, etc. are buried in the volcanic tuff, to restore the forest landscape provides an excellent condition. The high-level forest vegetation consists of a family of stone pine called Sigillaria; the middle forest is dominated by ferns, similar in shape to those of the current tree, and Paratingia, which is not well-defined, . Other mid-vegetation species include the original genus Taeniopteris and Pterophyllum; herbaceous plants are sporadically distributed including Sphenophyllum and Peopteris.