A preliminary study of the magnetostratigraphic column suggests that the upper and lower parts separated at a depth of 386. 0 m from the surface belong to the Gauss normal polarity chron and the Gilbert reverse polarity chron respectively.

• 磁性地层初步研究表明；以距顶深度386.；0m处为界；以上为高斯正向极性带；以下为吉尔伯特反向极性带。