内蒙古阿木山组

阿木山组自建组以来就被广泛应用,20世纪曾是内蒙地槽区上石炭统的代名词,随着地质研究程度的不断提高,大地构造单元的划分、地层区划等也在发生变化。通过区域资料的综合研究,现认为阿木山组是华北板块北部晚古生代大陆边缘的沉积产物,出露区只限于索伦—西拉木伦河断裂以南,形成时代为晚石炭世至早二叠世(C_2-P_1),灰岩层内富含蜓、珊瑚等化石。其与三面井组是同一地层区不同地层分区的产物。

Amushan Formation in Inner Mongolia

The Amushan Formation has been widely used since its founding. It was once synonymous with the Upper Carboniferous of Inner Mongolia geosyncline zone in the last century. With the improvement of geological research, the subdivision of tectonic units, stratigraphic regionalization and other changes have also occurred. Based on a comprehensive study of regional data, the authors hold that the Amushan Formation is the deposition production of the northern Late Paleozoic continental margin of North China plate, and the outcropped areas are restricted to south of Solon- Siramulen River fault. It was formed during the upper Carboniferous-Lower Permian period (C2-P1), and its limestone layer is rich in fusulinids, corals and other fossils. The Amushan Formation and the Sanmianjing Formation are products of different stratigraphic subdivisions in the same stratigraphic region.