四川龙门山区的泥盆系,地层厚度巨大,生物门类齐全,属种繁多,数量丰富(?)化石保存完美。虽然分布范围较窄,但在龙门山区本部构造简单,横向变化较有规律(?)加之(?)(?)共几条支流横穿而过,露头良好,实为我国南方泥盆系研究的理想地区之一。然而在解放前由于国民党反动统治腐败,四川军阀割据,士匪横行,加上地形险峻(?)交通不便,至使龙门山区的泥盆系和其它地质工作一样(?)研究很差。解放后,随着社会主 The Devonian in Longmen Mountain, Sichuan Province has a huge thickness of stratum and a wide range of biological species. It is rich in species and abundant in abundance (?). Although its distribution is rather narrow, its structure in the Longmenshan section is simple and its horizontal variation is more regular (?). In addition, there are several tributaries flowing across it and the outcrops are well exposed. In fact, One of the ideal areas. However, before the liberation, due to the Kuomintang’s reactionary reign of corruption, Sichuan’s warlords and rampant bandits and steep terrain (?) Had inconvenient transportation, making the study of the Devonian in Longmen Mountain, like any other geological work, very poor. After liberation, along with socialism