试论历史时期固城湖的变迁岑宇玉一般论述：固城湖是古丹阳湖的一部分；随着泥沙淤积和围垦，古湖泊消亡为今日之固城、石臼、丹阳诸湖。如果不考虑时间尺度与现实发展过程，称之谓“古丹阳湖”的该区域是处于茅山隆起西侧的相对沉降盆地；从漫长的地质年代来说，沧海桑田... On the Evolution of Gucheng Lake in Historical Period Cen Yuyu General Discussion: Gucheng Lake is a part of the ancient Danyang Lake. With the sedimentation and reclamation, the disappearance of ancient lakes is now Gucheng, Shijiu and Danyang lakes. If we do not consider the time scale and the actual development process, the area called “ancient Danyang Lake” is a relative subsidence basin on the west side of the Maoshan uplift; from the long geological era,