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海月(Placuna placent Linné)贝壳沉积层主要分布在琼北罗谷农场的鸟树村、林洞村和塘洞村一带。其中以鸟树村的海月层厚度最大,达4米多,高程7.5米.沉积年代为距今三、四千年;而与海南地区的其它沉积物比较,这里的升降幅度最大。
Sea shell (Placuna placent Linné) shell sediments are mainly distributed in the bird farm on the Luo Valley Farm, Lin Dong Village and Tong Village area. Among them, the bird-moon village has the largest sea-moon thickness of more than 4 meters and an elevation of 7.5 meters, dating from 3,000 to 4,000 years ago, and has the largest increase and decrease compared with other sediments in Hainan.