四川龙门山早二叠世地层颇为发育,是我国西南地区研究下二叠统较为详细的地区之一,尤其在东北端的广元一带,前人做了大量的工作。始自30年代初期,赵亚曾、黄汲清就对该区二叠系进行了研究。之后,其他地质先辈也陆续作了不少工作,基本上建立了二叠系的地层层序。但大量的区测、普查工作主要是在解放以后进行的。尤其是70年代,各地质单位进一步开展了专题性研究,详细地测制地层剖面和采集古生物化石,使得这一地 The Early Permian strata in Longmenshan, Sichuan, developed quite well and is one of the more detailed areas under study of the Lower Permian in the southwestern region of China. In particular, a large amount of work has been done by predecessors in the Guangyuan area at the northeast end. Beginning in the early 1930s, Zhao Yazeng and Huang Jiqing studied the Permian in the area. After that, other geological predecessors also made a lot of work one after another, and basically established the Permian stratigraphic sequence. However, a large number of district surveys and censuses were carried out mainly after the liberation. In particular, in the 1970s, various geologic units further conducted thematic studies, which detailedly measured the stratigraphic sections and collected paleontological fossils, making this place