嵩箕地区山西组的新认识

NEW RECOGNITION ON SHANXI FORMATION IN SONGJI AREA

本文研究了嵩箕地区山西组的４条剖面。提出了嵩箕地区山西组时代为早二叠世早期（山西组下段）至早二叠世晚期（山西组上段）。认为山西组是在三角洲环境下形成的，主要可采煤层二１煤是三角洲平原上的沼泽沉积。文章指出了丰富的大羽羊齿植物和银杏类植物在豫西地区山西组的出现，不是以植物迁移的时间差所能解释的，而是由于岩石地层单位穿时的结果。根据地层指南“组”的定义，本区山西组与邻区作岩性比较后认为，引用“山西组”这一名称来命名这段地层是恰当的。

Based on the researches on the four sections of Shanxi Formation in Songji area.the authorshave put forword that the era of Shanxi Formation in Songji area belonged to the early Early Per-mian(the lower part of Shanxi Formation)to the late Early Permian(the upper part of ShanxiFormation), and Shanxi Formation formed in the environment of delta. The main minable seamⅡ_1 belenged marshy sediment in delta plain. The authors also raised that the appearance of abun-dant Gigantopterides and Ginkgopsida plants in Shanxi Formation of west Henan Province wasthe result of diachronous of rock─stratigraphic unit,it could not explain using the time differentof plants migration. According to the definition of “Formation”in“Guide to stratigraphy”,aftercomparing the lithology of Shanxi Formation in this area with adjact area, it is suitable to namethe strata of the number after “Shanxi Formation”.