海南岛南端三亚地区的水尾岭和西瑁岛发育着一种现代碳酸盐沉积——骨针灰岩,由八射珊瑚海鸡冠类骨针组成。有关它的报道最早见于王国忠等(1979)对鹿回头珊瑚岸礁的研究,之后,朱袁智等(1982)又对其岩石学进行了初步研究。本文拟就岩石学特征及形成条件作一初步探讨。 At the southern tip of Hainan Island, the water tailings and Xidan Island, Sanya, developed a modern carbonate deposition - bone acicular limestone, composed of octopus coral sea crested coronoid spicules. The earliest reports about it were from Wang Guozhong et al. (1979) on the study of Luhuitou coral reefs, after which Zhu Yuanzhi et al. (1982) conducted a preliminary study on the petrology. This paper intends to make a preliminary discussion on petrology characteristics and formation conditions.