PALEOMAGNETIC STUDY OF Dc₁ AND Dc₂ CORES IN THE EAST CHINA SEA

We got two cores from 10 miles east of Zhoushan islands about 29 m in water depth in 1979 and 1980.D_C1 core, 26 m long, can be divided into two layers; 0-19.4 m, brown-yellow, silty-clay, rich in foraminifera, 19.3-26 m, grey silt. D_C1 core, 91 m long, 7 miles south of D_C1 core. The colour for 0-16.6 m is the same as for 0-19.4 m of D_C2 core, brown silty-clay, rich in foraminifera too. The results of paleomagnetic measurements show:there are 464 specimens in D_C1 and D_C2 cores altogether; AF demagnetization often shows that 95% of all the specimens belong to normal polarity epoch, and the others are reversal ones.
We consider that more stranger intensity may represent the warming period and transgression period, and vice versa. At least DC, and D_C2 cores provide such an evidence for this. It is obvious that glacial period should be low peak period of intensity, and interglacial period should be its high peak period.