Abstract: Evluation of paleosalinity of lake water in the Dingying depression based on borond content is discussed. Taking into consideration of diagenetic factors, an improved formula on E. L. Couch's is proposed as follows that gives higher accuracy:
logSp=(log B_is-1.375)/(0.49)
By this formula, the salinity of lake water in early Tertiary in Dongying depression worked out. At the deposition of lower Chunhuazhen formation, the salinity of lake water is believed to be greater then 40%,and of upper Chunhuazhen formation 21-40%. The salinity dropped to less than 5% during the deposition of Shasan (Es₃)menber, incresed to greater than 10% from upper Shaer (Es₂)menber to lower Shayi(Es₁) menber, and then again dropped to less than 5%. Such variations in salinity find their expression also in paleontology.

摘要： 文内采用硼含量计算古盐度方法,由于引用了成岩系数改善了考奇(E.L.Couch)计算式,提高了计算的准确度,其计算式如下:
logSp=(log B_is-1.375)/(0.49)
据上式对东营凹陷早第三纪湖水的古盐度作了计算.纯化镇组早期古盐度大于40%,晚期的古盐度则21～40%,沙三段沉积时则降低小于5%,沙二段晚期至沙一段早期又升高大于10%;而沙一段沉积时古盐度又降至5%以下.这种高低的变化也反映到古生物化石方面.