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应用ＷＲＤｉｃｋｉｎｓｏｎ等人对砂岩与物源分析结果，对我国华北地台第一沉积盖层的宣龙内陆海长城系的常州沟组和串岭组的砂岩和石英岩状砂岩进行投点，结果表明，形成砂岩和石英岩状砂岩的主要物源，是内陆海南北两侧的大陆块蚀源区的克拉通源区。通过阴极发光分析，进一步揭示了克拉通古陆火成岩的物源略多于变质岩。重矿物鉴定结果，确定了火成岩主要为花岗岩和花岗闪长岩；变质岩为合石榴石斜长片麻岩和角闪片麻岩等。克拉通岩石经过长期风化，碎屑经过远距离搬运和充分地离解和分解之后，在宣龙内陆海沉积了常州沟、串岭沟组的砂岩和石英岩状砂岩。
Based on the sandstone and provenance analysis by WR Dickinson et al., The sandstone and quartzite sandstone of Changzhou Gouxian and Lingling formations in the first sedimentary caprock of the North China terrane, It shows that the main source of sandstone and quartzite sandstone is the source of craton in the block source area of continental blocks on both sides of the northern and southern Hainan. By cathodoluminescence analysis, further revealed that the origin of craton overland igneous rocks is slightly more than metamorphic rocks. The identification of heavy minerals identified the main igneous rocks as granite and granodiorite; metamorphic rocks are garnet plagiogranite and hornblende gneiss. After long-term weathering of the craton rock, the clastic transported through long distance and fully dissociated and decomposed, the sandstone and quartzite sandstone of the Changzhou ditch and the Chuanlinggou formation were deposited in the inland sea of Xuanlong.