晋东南上石炭统山西组的(竹蜓)类分带

在地处晋东南山字型构造前弧内侧的壶关、陵川、晋城、阳城、沁水等地,上石炭统山西组（阶）分布广泛。区内山西组的底界始于与太原西山北岔沟砂岩相当的第一砂岩、又称黄水沟砂岩之底,上界止于与太原西山骆驼脖子砂岩相当的第四砂岩、又称佳祥砂岩之底,为一套间夹海相石灰岩及重要可采煤层的海陆交替相煤系沉积。以往,关于区内山西组的底、顶界线,曾有两种不同的对比划分方案,后经长期的争论和深入的工作,上述划分对比方案及岩石组合内容,终于为原持争议的双方所一致承认和接受（1982.6.）。在本区的山西组中,海相灰岩目前可见三层,自下而上依次名为毛古掌灰岩（L4下）、

FUSULINID ZONATION OF THE UPPER CARBONIFEROUS SHANXI FORMATION,SOUTHEASTERN SHANXI

In southeastern Shanxi the Shanxi Formation contains three beds of fusulinid-bearing limestones; from the base upward they are Maoguzhang limestone,Fucheng limestone and Xiaodonggou limestone,which contain 47 species,subspecies or varieties and some indeterminate species in 15 genera. Their systematic evolution permits us to divide them into one zone and two subzones: Pseudoschwngerina,（s.l.）zone: 2.Schwagerina andresemsis-Schwagerina guembeli subzone; 1.Schwagerina nobilis subzone. The Pseudoschwagering （s.l.）zone represents the three above-metioned beds of fusulinid-bearing limestones of the Shanxi Formation.The Schwagerina nobilis subzone includes the Maoguzhang limestone and the Fucheng limestone,and the Schwagerina andresensis-Schwagerina guembeli subzone represents the fusulinid fauna of the Xiaodonggou limestone. The Upper Carboniferous Shanxi Formation in southeastern Shanxi is equivalent to the greater part of the Baomoshan Formation of the Upper Carboniferous in Puan and Qinglong,Guizhou,and the upper part of the Wolfcampian to the base of the Leonardian in North America; it can also be correlated with the Sakmarian of the Urals region,U.S.S.R.