一、荆江与洞庭湖的关系荆江为长江流经川鄂之间的三峡地区进入江汉平原的河段,早在白垩—第三纪它便是滚滚东流的长江的一段。洞庭盆地是在第三纪末才断陷成为盆地。发育成为完整的洞庭盆地水系是在第四纪时期。在古江汉平原与洞庭盆地之间有一华容隆起,由古老的变质 I. Relationship between Jingjiang and Dongting Lake Jingjiang flows into the reach of the Jianghan Plain through the Three Gorges area between the Yangtze River and Sichuan-Hubei region. As early as the Cretaceous-Tertiary, it was a section of the Yangtze River flowing eastward. The Dongting Basin became a basin by the end of the Third Century. The development of a complete system of water in the Dongting Basin was in the Quaternary period. There is a Huarong uplift between the ancient Jianghan Plain and the Dongting Basin, from the ancient metamorphism