滇东华宁盘溪火车站以北的金山—大石山地区发育中、晚泥盆世的丘状珊瑚礁。以Ａｌｖｅｏｌｉｔｅｓ和Ｔｈａｍｎｏｐｏｒａ为代表的床板珊瑚为造礁生物。纵剖面上岩相变化的记录清楚地表明，该礁体经历了定殖、繁殖和衰亡三个阶段。海水变浅及其盐化是导致礁体衰亡的直接原因 Middle and late Devonian mound coral reefs developed in Jinshan-Dashi Mountain area north of Huaxi Panxi Railway Station in eastern Yunnan. The bed coral represented by Alveolites and Thamnopora are reef creatures. The records of the lithofacies changes in the longitudinal section clearly show that the reef experienced three stages of colonization, propagation and decline. Shallow saltwater and salinization are the direct causes of the decline of the reef