海南岛为一巨大火成岩侵入体,水成地层多被冲刷,榆林港位岛边缘水成岩存留尚多、走向?皆东北西南,大致向西北倾斜。 (一)大安村石英岩——为本区最老地层,以岩性论与李承三氏之海南岛北部牛屎山石英岩相若,似可与广东北部盲于峡石英岩相比,可能为泥盆纪 Hainan Island is a huge igneous intrusive body. Most of the aquifer strata have been washed away. There are many remaining sedimentary rocks in the edge of Yulin Harbor Island. Both of them are northeast and southwest, and are generally inclined to the northwest. (A) Daancun quartzite, the oldest strata in this area, is similar in lithology to that of the Liushihe quartzite in the northern part of Hainan Island, and may be similar to the blind quartzite quartzite in the northern part of Guangdong Province. Devonian