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对浙西北上二叠统长兴组、大隆组及下三叠统政棠组沉积特征、生物生态等的研究表明,长兴组、大隆组和政棠组为一套浊积岩系沉积,沉积背景为一向东南倾斜的被动大陆边缘,印支期造山作用使其发生了强烈的前陆褶皱-冲断变形,岩石地球化学分析结果表明在浊积岩沉积时期,推测可能存在部分来源于晚元古代岛弧和晚元古代造山带的物源。
Sedimentary characteristics and bio-ecology of the Upper Permian Changxing Formation, Dalong Formation and the Lower Triassic Tongtang Formation in the northwestern Zhejiang Province show that Changxing Formation, Dalong Formation and Zhengtang Formation are the sediments of turbidite series, The sedimentary background is a passive continental margin that has been tilted to the southeast. During the Indosinian orogeny, the foreland fold-thrust deformation occurred. The geochemical analysis shows that during the sedimentary period of turbidites, it is speculated that some of them may originate from late Proterozoic island arcs and provenance of the Late Paleozoic orogenic belt.