Abstract:

We have carried out the diatom analysis of the cores of hand drilling D65 in the central Dayanghe plain of the eastern Liaodong peninsula, and made the successive electric conductivity measurements on the cores of hand drilling B3 of Bachagou in Changxing island in the west of Liaodong peninsula and on the cores of hand drilling X11 and X21 and mechanical drilling X33 in the lowerreach of Liaohe plain. Based on these diatom analysis and conductivity measurements, we obtained the diatom mappings and electric conductivity mappings of the cores, respectively.  It is shown that there are  marine facies layers  over 6 meters in thickness throughout the plain and  indicated that the seawater had reached the coastal plain in the Holocene, and that the transgression of the seawater  had occupied the coast for a long period In addition, it is revealed that there are continental facies or marineterrigenous facies formation  widely deposited beneath the marine facies bed in the depth about 57 meters, which indicates that the widespread marine regression event had occurred during  the transgressive period in the Holocene It can be presumed that they were formed in the time span from the early Holocene to the middle Holocene (9 3008 000 cal. a B.P.) according to the known 14C age dating.

Key words:

Holocene transgression; diatom analysis; electric conductivity; marine facies bed; continental facies bed