自我国已故著名的古生物学家斯行健教授研究发表延长植物群的论文以来,在我国地质学界和古生物学界就一直遵循延长植物群是晚三叠世的结论。随着鄂尔多斯盆地石油勘探工作向深度和广度发展,有关地层古生物的资料也在不断地积累与丰富。因之,现在对延长植物群和延长群的地质时代问题重新提出来讨论是必然的。 Since the late famous Paleontologist Prof. Shi Xingjian has been studying the publication of the paper on the prolongation of flora, it has been concluded in our geology and paleontology circles that the extension of flora is late Triassic. With the development of oil exploration in the Ordos Basin to a depth and breadth, the information on the paleosol in the strata is also continuously accumulated and enriched. Therefore, it is inevitable to reconsider the issue of extending the flora and prolonging the geological age of the group.